Notes
On the permission sets page you can create, view, and manage permission sets.
A permission set is a collection of settings and permissions that give users access to various tools and functions. Permission sets extend users' functional access without changing their profiles.
What is difference between profile and permission set?
The key difference between the two is that the Profile is the users base set of permissions and all users are assigned to one. A Permission set is just a way to give a user or a set of users extended permissions without granting them to the entire group of users with a certain Profile.