Mainstream (adjective)

1. Belonging to or characteristic of the mainstream of society, culture, or opinion.
2. Widely accepted or popular.
3. Conforming to the ideology or dominant values of a particular society or group.

Origin:

Mid 19th century: from main (in the sense "principal") + stream.

Examples:

1. The movie was mainstream.
2. The music was mainstream.
3. The fashion was mainstream.
4. The idea is mainstream.
5. The product is mainstream.