Hi,
Ressesion is a significant drop in economic activity, lasting more than a few months. It is measured by employment rate and real gross domestic product (GDP). In simple words: The entire activity slows down. That means: less sales, less production, less jobs available, business shut down, workers are fired, pressure to lower salaries, people have less money (hence spend less, specially at "non must" activities [e.g: Resteurants, shows, movies, bars....])..... Bad to everyone..... It's even worst if it comes together with inflation....
Best regards,