What are enantiomers&what is racemisation

Enantiomers can be defined as one of two different stereoisomers of a compound which is the mirror image of the second stereoisomer of that compound. Enantiomers can be classified as specific types of optical isomers. It is important to note that two enantiomers of a compound must be non-superimposable on each other. Therefore, enantiomers can be alternately defined as optical isomers that are non-superimposable mirror images of each other. 
A mixture containing two enantiomers in equal proportions is known as racemic mixture and the process of conversion of enantiomers into a racemic mixture is known as racemisation.

Enantiomers:

Enantiomers can be defined as one of two different stereoisomers of a compound which is the mirror image of the second stereoisomer of that compound. Enantiomers can be classified as specific types of optical isomers. It is important to note that two enantiomers of a compound must be non-superimposable on each other. Therefore, enantiomers can be alternately defined as optical isomers that are non-superimposable mirror images of each other. The presence of a single chiral atom (or a structural feature in a compound that results in something similar) can result in the compound as a whole having two different possible structures, each of which are non-superimposable mirror images of each other. Each of these possible structures can be referred to as an ‘enantiomorph’. The structural property of a chemical compound that allows it to have two different possible enantiomorphs is often referred to as enantiomorphism.

Racemisation:

A mixture containing two enantiomers in equal proportions is known as racemic mixture and the process of conversion of enantiomers into a racemic mixture is known as racemisation.