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Hi @anitacarolina Poloniex or Poloniex.com is a crypto exchange. So if you have a particular crypto like BTC you can exchange it for another crypto like steem .
For this to happen you need to have an account on Poloniex.com or some other exchange.
So crypto exchange basically means a site where you can exchange one crypto for another depending upon what you need and what you have.
For exchange if you check you wallet https://steemitwallet.com/@anitacarolina/transfers you would see that you have 1.44 steem .
Now suppose you want to change this to bitcoin you would need the help of an exchange site like Poloniex.com
Steemit on the other hand is a platform where you can write a post .In return you may earn a reward if you buy an upvote or if other readers upvote your post.
Hope this info helps :)
Really appreciate your stopping by and leaving your wonderful comment

Hi @thetimetravelerz thanks for the explanation😄😄

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