While (or whilst) means 'during the time when something else happens'. When can mean the same as while, but when can also refer to a point in time. Compare. during the time something happens.

When can you use whilst?

Whilst is mostly used in British English, though way lesser than while. While can be used as a conjunction, preposition, noun or verb, whereas 'whilst' is used only as a conjunction or adverb. When used as conjunction/adverb, both the words mean during or at the same time as.

How do you use whilst in a sentence?

1 She sang whilst she worked. 2 He gained valuable experience whilst working on the project. 3 All men whilst they are awake are in one common world;but each of them,when he is asleep,()is in a world of his own.