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What is a Capture the Flag competition?

Jeopardy-style CTF

Jeopardy-style competitions usually involve multiple categories of problems, each of which contains a variety of questions of different point values and difficulties. Teams attempt to earn the most points, but do not directly attack each other. Rather than a race, this style of game play encourages taking time to approach challenges and prioritizes quantity of correct submissions over the timing.

Attack-defence CTF

In an attack-defense style competition, each team is given a task to defend a network or server and the other will attack it. Depending on the nature of the particular CTF game, teams may either be attempting to take an opponent’s flag from their machine or teams may be attempting to plant their own flag on their opponent’s machine.

Source

Typical categories

Video explanation