An emoticon is a short sequence of keyboard letters and symbols, usually emulating a facial expression, that complements a text message.

Hypertext markup language

E-commerce is a transaction of buying or selling online. Electronic commerce draws on technologies such as mobile commerce, electronic funds transfer, supply chain management, Internet marketing, online transaction processing, electronic data interchange(EDI), inventory management systems, and automated data collection systems. Modern electronic commerce typically uses the World Wide Web for at least one part of the transaction's life cycle although it may also use other technologies such as e-mail.

E-commerce businesses may employ some or all of the following:

• Online shopping web sites for retail sales direct to consumers
• Providing or participating in online marketplaces, which process third-party business-to-consumer or consumer-to-consumer sales
• Business-to-business buying and selling
• Gathering and using demographic data through web contacts and social media
• Business-to-business (B2B) electronic data interchange
• Marketing to prospective and established customers by e-mail or fax (for example, with newsletters)
• Engaging in pretail for launching new products and services
• Online financial exchanges for currency exchanges or trading purposes

A learning system based on formalised teaching but with the help of electronic resources is known as E-learning. While teaching can be based in or out of the classrooms, the use of computers and the Internet forms the major component of E-learning. E-learning can also be termed as a network enabled transfer of skills and knowledge, and the delivery of education is made to a large number of recipients at the same or different times. Earlier, it was not accepted wholeheartedly as it was assumed that this system lacked the human element required in learning. 

However, with the rapid progress in technology and the advancement in learning systems, it is now embraced by the masses. The introduction of computers was the basis of this revolution and with the passage of time, as we get hooked to smartphones, tablets, etc, these devices now have an importance place in the classrooms for learning. Books are gradually getting replaced by electronic educational materials like optical discs or pen drives. Knowledge can also be shared via the Internet, which is accessible 24/7, anywhere, anytime. 
 

Chat refers to the process of communicating, interacting and/or exchanging messages over the Internet. It involves two or more individuals that communicate through a chat-enabled service or software.Chat is also known as chatting, online chat or Internet chat.

We can also say that Chat is a real-time communication between two users via computer. Once a chat has been initiated, either user can enter text by typing on the keyboard and the entered text will appear on the other user's monitor. Most networks and online services offer a chat feature.

In the context of relational databases, a foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table.In simpler words, the foreign key is defined in a second table, but it refers to the primary key or a unique key in the first table. For example, a table called Employee has a primary key called employee_id. Another table called Employee Details has a foreign key which references employee_id in order to uniquely identify the relationship between both tables.

The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table.In database relational modeling and implementation, a unique key is a set of zero or more attributes, the value(s) of which are guaranteed to be unique for each tuple (row) in a relation. The value or combination of values of unique key attributes for any tuple cannot be duplicated for any other tuple in that relation.

When more than one column is combined to form a unique key, their combined value is used to access each row and maintain uniqueness. Values are not combined, they are compared using their data types.

Since the purpose of the foreign key is to identify a particular row of the referenced table, it is generally required that the foreign key is equal to the candidate key in some row of the primary table, or else have no value (the NULL value.). This rule is called a referential integrity constraint between the two tables.Because violations of these constraints can be the source of many database problems, most database management systems provide mechanisms to ensure that every non-null foreign key corresponds to a row of the referenced table.

For example, consider a database with two tables: a CUSTOMER table that includes all customer data and an ORDER table that includes all customer orders. Suppose the business requires that each order must refer to a single customer. To reflect this in the database, a foreign key column is added to the ORDER table (e.g., CUSTOMERID), which references the primary key of CUSTOMER (e.g. ID). Because the primary key of a table must be unique, and because CUSTOMERID only contains values from that primary key field, we may assume that, when it has a value, CUSTOMERID will identify the particular customer which placed the order. However, this can no longer be assumed if the ORDER table is not kept up to date when rows of the CUSTOMER table are deleted or the ID column altered, and working with these tables may become more difficult. Many real world databases work around this problem by 'inactivating' rather than physically deleting master table foreign keys, or by complex update programs that modify all references to a foreign key when a change is needed.

1. Design View

The table view that is used to design the structure of a table is called design view. It is used to specify name, data types and description of fields. Primary key is also specified in this view the structure of an existing table can also be changed in design view.

2.     Datasheet  View

The table view that is used to enter, delete or modify data in a table is called datasheet view. The table in this view is displayed in rows and columns. The name of each field is displayed at the top of the column as header. Each row contains a complete record. The table or query is opened in datasheet view to perform different operations on data in the table. These operations include adding, deleting, updating and searching data etc.

Switching between Views:

Following procedure is used to switch between table views:

1. Click on View menu.
2. Select Datasheet View or Design View from the menu. The table will be displayed according to the selected view option.

1. Web address is the URL of your web page while Email is used to send electronic messages to each other using computer networks.
2. In the Email @ is used and you can never find it in any web address.
3. The email address is oftenly used in lower case, while websites or web address are written in mixed letters.
4. With email you can always receives electronic mails while web address is not used to receive any mails sent to you.
5. A web address is used to access a website where you can get information while email is not used to get any information.

web server is a computer system that processes requests via HTTP, the basic network protocol used to distribute information on the World Wide Web

you cannot add a 6th subject. a 6th subject can only be taken if a person is very bad at a particular subject and wishes to remove it from his/her curriculum.

Contents of <head> are not displayed on web page. It contains metadata about the web page contents such as its title ,character set, language, author etc. These metadata are used by search engines to better identify our page contents.

<title> is a sub element of <head>, used to display title of a web page. Like, if you visited google.com, you'll see "Google" written on your tab. 

165

No it will. Not I have cleared the fact from my it teacher

Yes it will affect ur CGPA

It can save you from accidental data loss and may help you to save up your storage.

idk

Spam