Staking is the process of bounding tokens to a validator node so it can vote on block mining on a Proof of Stake (PoS) Blockchain.

This Proof of Stake is a consensus mechanism that secures the Blockchain against possible malicious attacks.

This is different from Proof of Work (PoW) blockchains such as Bitcoin where the validator needs to get done a work load in order to mine a block.

Delegating is the process where an investor locks their tokens and allows a validator node to mine blocks with them on a Proof of Stake (PoS) Blockchain.

Delegating tokens is a quite profitable type of investment, where the investor locks his tokens to a validator and gets high interest rewards in return.

The delegated tokens are not accessible by the validator or anyone, just by the owner, so in case of an attack to the validator the delegated tokens are safe.

The most common risk for a delegator is that the validator they're delegated with is penalized by the network for fraudulent actions (also known as slashing) such as double signing blocks, attacks to the network or big downtimes of their servers.

Staking activity rewards are shared equally between all network nodes accordingly to the staked token amount on each node. Each stake provider receives equal rewards share accordingly to their amount of delegated tokens in their nodes. Those rewards are then shared with the node delegators.

Each validator node has a commission fee so that it earns a percentage of the rewards generated by the node.

As an example, if the rewards corresponding to your delegation are 100 tokens and the validator has set a 10% comission, you'll earn 90 tokens out of your rewards and the validator 10 tokens.