Is a title mandatory?

It might seem like a strange question but I would like to publish post without a title (only a short sentence in content) and I would like to be sure it is possible and that there is no caveat to do so.

I read the Aside Post Format doesn’t need a title so I guess the usual post doesn’t need one either. And I don’t want to use an Aside Post Format only on that purpose if I don’t need to.

Thank you for your help about that!