Learn English Mistakes

When you look at someone or something you are interested in appearance.

Generally we look at things that are static.

For example:

Look at these photos, they're really good.
I went to the art gallery to look at the exhibition of paintings.

Watch is a verb.

When you watch someone or something you are interested in what happens.

Generally we watch things that move or change state.

For example:

I watch TV every night.
The security guard watched the shoplifter steal the clock.

!If I say to you "Look at him!" I mean for you to check out his appearance. But, if I say to you "Watch him!" I mean it as a warning.

See also see vs watch.