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What is Lightning Data Service?
We use lightning data service for creating, deleting, editing, or loading a record in our component without Apex code. It handles field-level security and sharing rules. Lightning data service enhances the user interface and performance consistency. The lightning data service's main advantage is we can carry out basic tasks without Apex code.follow this link
How can we use Lightning components with Salesforce1 Mobile App?
We can use Lightning Components with the Salesforce1 mobile app by creating a traditional lightning tab that refers to the component, and we can add that tab to the Salesforce1 mobile navigation.
Explain Lightning out?
If we want to use our component on the external site, we have to use lightning out. The advantage of lightning out is we can utilize lightning components in a visual force page.