A server is a computer that provides data to other computers. It may serve data to systems on a local area network (LAN) or a wide area network (WAN) over the Internet. Many types of servers exist, including web servers, mail servers, and file servers. Each type runs software specific to the purpose of the server. There are different types of computer system: Personal computer, Workstation, Minicomputer, Mainframe and Supercomputer. Personal computer: A personal computer can be defined as a small, relatively inexpensive computer designed for an individual user.

An arithmetic logic unit (ALU) is a digital circuit used to perform arithmetic and logic operations. It represents the fundamental building block of the central processing unit (CPU) of a computer. Modern CPUs contain very powerful and complex ALUs. In addition to ALUs, modern CPUs contain a control unit (CU).

A slide transition is how one slide is removed from the screen and the next slide is displayed during a presentation. PowerPoint offers many entertaining and different slide transition schemes- the trick is to be careful not to use too many different schemes in one presentation. Be selective and consider the appropriateness of the scheme before you apply it to the different slides. Test them out by running the Slide Show and evaluate them for effectiveness. Quality rather then quantity is the key.

Some of the limitations of internal memory are:

• They are not expandable .
• They are fixed .
• Internal memory has the limited capacity of memory .
• It is temporary in nature .
• In EEPROM, writing and reading of the data requires different voltages.

The word wireless is dictionary defined as "having no wires". In networking terminology, wireless is the term used to describe any computer network where there is no physical wired connection between sender and receiver, but rather the network is connected by radio waves and/or microwaves to maintain communications. Wireless Networks uses spread-spectrum or depends on OFDM technology. It enables a user to move within a wide coverage area but still connected to the network. Wireless networks are classified into different type such as wireless LAN, WAN, MAN, PAN, Hybrid, Ad-Hoc networks.

Android version indicates the version of Android platform. The bigger the version number is, the newer the Android is. Android has code names for different versions too. They are all confectionery-themed (Pie, Donut, Lollipop, Marshallow, etc.) and have been in alphabetical order starting from Android Cupcake 1.5. Till now 15 Versions of Android are fully released and the 16th Version (Android P) is partially released (Developer Preview 1). The first commercial version, Android 1.0, was released in September 2008.

Communication channel is the channel in which two computers can communicate with each other by sending data or sharing information between them

Business process management (BPM) is a discipline in operations management in which people use various methods to discover, model, analyze, measure, improve, optimize, and automate business processes.

The purpose of adding an expansion card or board to a computer's motherboard is to add or expand some sort of functionality to the computer that it did not have before. Expansion cards are a way to upgrade a computer. Some examples are memory chips, sound devices, modems or graphics card etc. In addition, a circuit board is identified by different terms like a card, expansion card, expansion board, adapter card, interface card, add-in and add-on etc. A video card (also called a display card, graphics card, display adapter, or graphics adapter) is an expansion card which generates a feed of output images to a display device (such as a computer monitor).

The strengths of a computer system are:

• A computer system is accurate and much more precise in comparison to a human.

• A computer system can never commit a mistake. If a mistake occurs, then it is because of the person operating the system.

• A computer can does not get tired and can keep working on without complaining.

•It provides much more faster calculations and can do processing tasks which are almost impossible to be done by human mind.

However, a computer still lacks behind against a human mind in certain aspects.

IT stands for Information Technology wherein ITES stands for Information Technology Enabled Services. ITES is a part of IT ,ITES also has a part called BPO Business Process Outsourcing. The word IT means information technology. On the other hand, for ITES, it refers to the all those services that are technology-enabled, or done with the help of technology. The main objective was to enable business strategy through IT assistance and to use IT to achieve the goals of a business organization. IT is Information technology whereas ITES is IT-enabled service and ITES is a service that applies IT services to different fields, it uses soft skills such as communication. ITeS is a form of Outsource services which involves IT in different fields such as Insurance, Finance & Banking, and Telecommunication.