Eth noob wants to understand staking.

Hi guys,

Been lurking for a few months. Holding some ETH and DCAing every opportunity I get. I have been reading terms like 'staking', 'node' for which you need 32 ETH and can earn interest but I don't follow what this is called and what I need to google to increase my knowledge. If someone can point me in the right direction, I would be ever so obliged.