A tag is a custom keyword you can associate with DigitalOcean resources.
You can use tags to organize your infrastructure and filter resources. For example, you can apply a tag to several DigitalOcean Droplets to identify them as web servers, then use that tag to collectively view, manage, or take actions on only those tagged Droplets.
Tags also integrate with some DigitalOcean products. For example, you can use a tag to automatically apply cloud firewalls or include Droplets in a load balancer pool.