What is the difference between zkVM and zkEVM?

Could you please elaborate on the key distinctions between zkVM and zkEVM? As I understand, both are related to the realm of blockchain and cryptography, but how do they differ in their functionality, use cases, and the level of security they offer? Are there any specific advantages or disadvantages of one over the other that are worth noting for those looking to implement them in their projects? Additionally, how do these technologies fit into the broader landscape of decentralized finance and smart contract execution?