Explore and trending
The two places to find things you are not already following, and what decides what appears in them.
Your feed is built from the accounts and topics you have already chosen. Explore and Trending exist for everything else.
Explore
Discovery by topic, plus people search. It is the place to browse a subject without following anyone in it first, and the topics it offers are the same ones your feed controls act on. See Topics and filters.
Trending
What is moving right now, together with the hashtag leaderboard. Trending reflects activity across Surf rather than your own history, so it is deliberately not personalised the way your feed is.
Hashtags
Every hashtag has its own page collecting the posts using it. Hashtags are also one of the things search covers.
Search
Search reaches posts, people, Spaces, sounds and hashtags from one field. With Semantic Search on it matches by meaning rather than exact wording, and Visual Search takes a photo as the query. See Search and Ask.