How does the search on kino-teatr.ru work through the "%s" stand?

Question

Search engines

Tell me how the search on kino-teatr.ru works through the base %s , for example, when you enter on Kinopoisk, you can substitute a word, and through the Cinema some kind of address is formed from numbers.

This is for quick searches from the browser's context menu.

kinopoisk.ru/index.php?first=no&what=&kp_query= %s

entered the query word "movie" https://www.kino-teatr.ru/search/112596120/937765/