Salesforce1 is the Salesforce mobile app available for iOS and Android. You can also run Salesforce1 via a mobile browser on any mobile device. This lecture goes through the process of rolling out Salesforce1 to your org. We also demonstrate some of the User Interface features of Salesforce1, along with Global Actions.
Salesforce1 Mobile App Admin Guide - https://resources.docs.salesforce.com/sfdc/pdf/salesforce1_admin_guide.pdf
Salesforce1 Mobile App Rollout Guide - https://www.salesforce.com/in/?d=7010M000002McDl