You don’t need a Zoom account to join a meeting, but you do need an account to host a meeting. You use your Account page on Zoom.us to set up, manage, and invite people to meetings.
Zoom offers a free and Pro version. The free version has a 40-minute time limit on meetings with 3 or more participants. If you need more than that, consider the Pro plan.
If you don’t have an account, click Sign Up and create one.