Difference between Admin, Team leader/Manager, Clinets/user profile and roles in Zoho Project

Difference between Admin, Team leader/Manager, Clinets/user profile and roles in Zoho Project

I've been wondering to find out the difference between the key feature  of Admin,Manager, and client/user in Zoho Project. I am student and trying to learn about the Zoho Project. I could not find the roles and profiles difference between this 3 users online.