Do I need MetaMask if I have Coinbase?

Hello, I'm a cryptocurrency enthusiast and I'm wondering if I really need MetaMask if I already have a Coinbase account. I understand that Coinbase is a well-known platform for buying, selling, and storing cryptocurrencies, but I've heard about MetaMask and its use with decentralized applications and smart contracts. Is MetaMask a necessity for me, or can I get by solely with Coinbase for my cryptocurrency needs? Are there any specific advantages or disadvantages to using both? I'd appreciate any insights you can provide. Thank you!