What is the Twitter timeline?

The Twitter timeline refers to the chronological stream of tweets displayed on a user's Twitter homepage or profile page. It includes tweets from accounts that the user follows, as well as tweets from their own account if they've posted any.

Here's how it works:

1. **Following**: When a user follows another account on Twitter, tweets from that account will appear in the user's timeline.

2. **Retweets**: Retweets of tweets by accounts the user follows may also appear in their timeline. A retweet is when a user shares another user's tweet with their own followers.

3. **Likes**: If someone the user follows likes a tweet, it may appear in their timeline under the "Liked" section.

4. **Replies and Mentions**: Tweets in which the user is mentioned (@username) or replies to other tweets may also appear in their timeline, depending on their settings.

5. **Algorithmic Timeline**: Twitter also offers an algorithmic timeline feature, which displays tweets that Twitter's algorithm deems most relevant to the user at the top of their timeline, rather than strictly in chronological order. However, users can opt to switch back to a purely chronological timeline in their settings.

The timeline is the primary interface through which users interact with Twitter, allowing them to stay up-to-date with the latest tweets from accounts they follow and engage with content on the platform.