What is the difference between troll and memes?

What is the difference between jokes, memes and trolls?

Joke:

Joke means a scenario that makes us laugh.

Meme:

Meme is a photo content that is rewritten to makes us laugh without hurting anyone…

Troll:

Troll means a content that is intentionally created to something or someone to be teased…

This is just my view about jokes,memes,trolls…