Attackers: Plant and detonate the Spike, OR eliminate all defenders; Defenders: Defuse the Spike, eliminate all attackers, OR let the round timer expire
Why people argue about this
People think they only need to eliminate all attackers (or defenders) to win a round, but actually, they must achieve one of several conditions: plant and detonate the Spike, defuse it, or have the timer run out before either side can claim victory. The confusion arises because these conditions are not mutually exclusive; multiple ways exist for a team to secure a round.