Couchbase Mobile allows developers to build applications with offline and online experiences. The mobile solution consists of Couchbase Lite, Sync Gateway, and Couchbase Server. To set up Couchbase Server, users need to create a DigitalOcean account, create a Droplet, and connect Sync Gateway. After setting up the Droplet, users can download and install Couchbase Server and Sync Gateway using the `wget` command and `dpkg` command. The tutorial will continue with configuring the Couchbase Server instance created on DigitalOcean.