You can use tags to manage your Contacts in a way that makes sense for you. With a combination of system-generated tags and your own custom tags, you’ll have an at-a-glance look at some of your Contacts' most noteworthy characteristics.
You can view all of the tags associated with a particular Contact under “Basic Info” on their Contact Profile.
You can also find any of your Contacts with a specific tag by using the filters on the Contact list view. Here’s how: