A URL scheme allows a user to launch the Salesforce1 app from a third­party or web application. An administrator or developer can customize a URL scheme to perform a specific action when the Salesforce1 app launches.

A URL scheme allows a user to launch the Salesforce1 app from a third­party or web application. An administrator or developer can customize a URL scheme to perform a specific action when the Salesforce1 app launches.

See this doc.