A proof of stake blockchain is a blockchain technology that allows users to stake their tokens or coins in order to receive block rewards. Staking rewards increase the user's chances of receiving block rewards and also encourages users to remain active on the network.
A decentralized directed acyclic graph (DAG) is a graph where each node is connected to one or more other nodes, and there is no single node that has control over the entire graph. The nodes in a DAG can be thought of as representing individual parts of a system, and the edges between them represent relationships or dependencies between those parts.