Discovery Piscine is a 5-day course that focuses on the basics of web development. It's completely free and anyone can attend by registering for the relevant term and you don't even need to be registered for 42 Prague.  Piscine, by contrast, is a 4-week bootcamp on the C programming language and is part of the selection process for future study. To participate in Piscine, an applicant must successfully complete online logic games and attend an introduction meeting.