How to add RSK mainnet to MetaMask?

Are you looking to expand your cryptocurrency portfolio by adding the RSK mainnet to MetaMask? Well, you've come to the right place! Adding RSK to MetaMask is a straightforward process that can be completed in just a few steps. But before we dive in, let's clarify what RSK is. RSK stands for Rootstock, a smart contract platform built on top of the Bitcoin blockchain that allows for the creation of decentralized applications and the use of smart contracts. Now, let's get started on how to add RSK mainnet to MetaMask. Have you already created an account on MetaMask and are familiar with its interface?