What is a Retweet?
A Tweet that you share publicly with your followers is known as a Retweet. This is a great way to pass along news and interesting discoveries on Twitter. You have the option to add your own comments and/or media before Retweeting. When using Twitter's Retweet icon, your Retweet or Quote Tweet will reference the Tweet you are sharing. When someone replies to your Quote Tweet, the author of the original Tweet will not be automatically added to the conversation. If you want to include the author of the original Tweet, you will need to mention their username.
In addition to sharing other’s Tweets on Twitter, with your own Tweet you can Retweet or Quote Tweet. This function is particularly useful when you want to re-post one of your older Tweets because it is relevant again, or Retweet your replies to other people when you want to make sure all of your followers see it.
Note: The original Tweet in your Quote Tweet does not count towards the character limit. Undoing a Quote Tweet will remove it from other timelines, however it may still appear on mobile devices displaying cached timelines or in cross-postings to third-party sites.