Tags can be used to help you sort through your leads and customers. It's a great way for you to better manager a long list of clients and identify special cases (e.g. a hot lead, a VIP client, etc)
Examples of how to use tags:
Tag to identify Hot or Cold leads.
Tag customers that are VIP or Veterans etc.
Tag leads in a specific stage (e.g. Quoted) to identify where they are in the sales process.
Use tags to quickly filter through your customer list or lead list.
Here's a quick video on how to:
Manage your tags.
Tag a customer and a lead.
Create filters based on tags.