Mainstream (mainstream / main stream) is what is currently at the peak of popularity. Imagine that everyone around suddenly starts wearing the same sneakers or listening to a certain song. That is mainstream. It encompasses everything: from fashion and music to movies. When something becomes mainstream, it means it has become part of the accepted culture, and most people support it or at least know about it.
The influence of mainstream on society is enormous. It shapes our tastes, influences what we buy, how we look, and even how we communicate. For example, if a certain style of clothing becomes mainstream, stores start offering more of those items, and we might also start wearing them to stay in the loop.
But mainstream is not always something bad or good. It is simply a reflection of what is currently relevant. Sometimes mainstream can change quickly when new trends emerge, and sometimes it can remain unchanged for a long time. The main thing is that it always reflects the current moods and interests of society.
Currently, having a large budget or an audience on social media allows one to manipulate the mainstream and encourage people to make purchases. So, one must be attentive to new trends.