What is a SEED Node?
Simply speaking, a SEED node is any node operated by Sesameseed which accepts staking from the community and distributes daily rewards in the form of SEED.
Another type of node, called a Test node, is operated by Sesameseed but does not distribute rewards for staking.
Please see this post for more information on all current SEED nodes: Current Policies
You can read the full Medium article on SEED nodes and Test nodes here.