What does commodity spike activity mean?

Spike is an activity form with limited time and special price. Only at a specific time and through a specific channel can we enjoy different preferential prices in peacetime. For example, the "limited time spike" of the Meituan APP food channel is. Usually, the 20% off group purchase package is limited to 40% off in the spike channel, which is very cost-effective but limited in quantity. Every day 1 1 point can start to grab four games.