What is this? It is a question on Twitter.?

[Girl From District 5]

I joined Twitter three days ago, and I'm already used to it, but i have a question:
I noticed in tweets they have these words starting with # and it's in a different color. how do you use one of those and what are they anyway? im very curious.

[nia]

Those are called 'hashtags'. It's sort of a way to categorize a tweet. You can search for hastags to see posts related to the words inside of the hashtag(s). Hope this helps! ^^;