If something happens after a particular date or event, it happens during the period of time that follows that date or event.

After is also a conjunction.

If you do one thing after doing another, you do it during the period of time that follows the other thing.

You use after when you are talking about time. For example, if something is going to happen during the day after or the weekend after a particular time, it is going to happen during the following day or during the following weekend.

After is also an adverb.

If you go after someone, you follow or chase them.

If you are after something, you are trying to get it.

If you call, shout, or stare after someone, you call, shout, or stare at them as they move away from you.

If you do something after someone, you do it for them, because they cannot or will not do it for themselves.

If you tell someone that one place is a particular distance after another, you mean that it is situated beyond the other place and further away from you.

If one thing is written after another thing on a page, it is written following it or underneath it.

You use after in order to give the most important aspect of something when comparing it with another aspect.

To be named after someone means to be given the same name as them.

If you say 'after you' to someone, you are being polite and allowing them to go in front of you or through a doorway before you do.

After is used when telling the time. If it is, for example, ten after six, the time is ten minutes past six.