Frequency illusion is a cognitive bias in which, after noticing something for the first time, there is a tendency to notice it more often, leading someone to believe that it has a high frequency of occurrence.
Put plainly, the frequency illusion is when "a concept or thing you just found out about suddenly seems to crop up everywhere."
en.wikipedia.org
Put plainly, the frequency illusion is when "a concept or thing you just found out about suddenly seems to crop up everywhere."