audience rating; viewership rating
Primarily used for television programs, but can apply to any broadcast or streaming content. Often expressed as a percentage.
昨夜のドラマの視聴率は20%を超えた。
Last night's drama had an audience rating of over 20%.
If the ratings are low, the program may be canceled.
That drama is famous for its high ratings.
The ratings went up after they got a new host.
This variety show gets high ratings every time.