What is the chain ID for Avalanche?

Excuse me, could you please clarify for me what the chain ID for Avalanche is? I'm trying to understand the technical aspects of this blockchain network, and I'm finding it a bit challenging to locate the specific information I need. I've heard that the chain ID is a crucial piece of data for interacting with Avalanche's blockchain, and I'd like to make sure I have the correct information before proceeding. Thank you in advance for your assistance.