The Tag allows you to identify your client, lead, or project according to group identifications that you prefer to filter later. As an example, if you have ten types of clients or projects depending on their sector of activity, or their specific needs, you can create a Tag for them and then, better identify them. In other words, it allows you to segment your database to make it easier to manage. You can find the tag in almost every form.
In the lead form:
In the project form
In the ticket form:
In the task form:
To set the Tag, go directly to Setup -> Settings -> Tag