When something you've recently learned or paid attention to suddenly seems to appear everywhere.

You know that moment when you learn a new word, and then you suddenly hear it everywhere? Or maybe you've noticed a particular type of car for the first time, and suddenly they seem to be on every street corner. That's the Baader-Meinhof Phenomenon (also commonly known as the "Frequency Illusion") in action. It's not that these things are appearing more frequently; it's that your awareness and sensitivity to them have increased. The thing has always been there, but your brain is now recognizing it more.
New Vocabulary
After reading a book, you come across the word 'ephemeral.' You've never really paid much attention to it before. But in the next week, you hear it in a song, see it in an advertisement, and your friend uses it in a conversation. Why? It's not that the word is suddenly more popular; you're just tuned into recognizing it.
Marketing and Brand Awareness
When launching a new product or service, use consistent messaging across multiple channels. Repeat key features or unique selling points in various contexts - social media, email campaigns, presentations, and casual conversations. This repetition makes the brand more noticeable and memorable to potential customers, creating a sense of ubiquity and importance.