Analytics is a collection of reports which provide insights into the behaviour and profile of visitors to your website/s.
Each report was created using the built-in Business Intelligence report builder, so you can create or modify reports of your own too.
When you run a report that requires a date range, you will see filter settings at the top of page, asking for the start and end date.
You must also enter the website and you can change the default interval for the date axis. These settings will be remembered when you the same or similar reports in the same session.