Is Gemini free or paid?

Hello there, I'm curious about the platform Gemini and I've been hearing conflicting information. Can you clarify for me, is Gemini a free service or is there a fee involved in using it? I'm particularly interested in understanding the costs associated with trading, depositing, and withdrawing funds. Additionally, are there any hidden fees or charges that I should be aware of before signing up? Thank you for your time and assistance in clearing up this confusion.