What is Coinbase commission fee?

Excuse me, I was wondering if you could clarify something for me regarding cryptocurrency transactions. Specifically, I'm curious about the Coinbase commission fee. Could you elaborate on what it entails? I've heard it's a fee associated with buying and selling digital assets on the Coinbase platform, but I'm not entirely clear on how it's calculated or if there are any other factors that affect it. Additionally, I'm wondering if there are any alternative platforms that offer lower commission fees for similar services. Your insight would be greatly appreciated.