Staking means setting aside your tokens into a "staking pool". Over time, token rewards are sent to the pool and distibuted among the holders to help them earn passive rewards.
The Altrucoin staking platform is an application that hosts staking pools for tokens. On the platform, token teams can make a customized staking vault, without any development work!
And for every partner vault that is created, their platform fees are sent to the Altrucoin vault to add to $ALTRU stakers' token rewards!