MPC, or Multi-Party Computation, wallets in crypto custody are a way to enhance the security and control of cryptocurrency assets. Here's a simplified explanation:

1. Control and Security: In the world of cryptocurrencies, controlling your private keys is crucial. Private keys are like the keys to your digital wallet, and whoever has them can access your funds. MPC wallets offer a more secure way to manage these keys.

2. Multi-Party Computation: Instead of a single person or entity holding the entire private key, MPC divides the key into multiple parts, or shares. Each share is held by different parties, often called "participants." These participants can be individuals, companies, or even devices.

3. Collaborative Control: To access your funds or make transactions, a majority or predefined number of these participants must come together and cooperate. This means no single person or entity can access your funds alone. It adds a layer of security because it's much harder for malicious actors to compromise the wallet.

4. Enhanced Security: Even if one participant's share is compromised, it is not enough to access your funds. This is a significant improvement over single-key wallets that are vulnerable if the key is lost or stolen.

5. Usability: MPC wallets are designed to be user-friendly. You can manage your funds without having to worry about storing or securing a single private key. It simplifies the process of securing your assets.

In summary, MPC wallets in crypto custody simplify the security of your digital assets by breaking your private key into multiple parts, held by different parties, which need to collaborate to access your funds. This approach enhances security and makes it more difficult for unauthorized individuals to compromise your cryptocurrency holdings.