# Using Amazon SimpleDB
<a name="using"></a>

**Topics**
+ [Available Libraries](AWSLibraries.md)
+ [Making API Requests](APIRequests.md)
+ [Request Authentication](RequestAuthentication.md)
+ [Working with Domains](WorkingWithDomains.md)
+ [Working with Data](WorkingWithData.md)
+ [Conditionally Putting and Deleting Data](ConditionalPutDelete.md)
+ [Using Select to Create Amazon SimpleDB Queries](UsingSelect.md)
+ [Working with Numerical Data](NumericalData.md)
+ [Tuning Queries](TuningQueries.md)
+ [Working with XML-Restricted Characters](InvalidCharacters.md)

This section describes major concepts you should understand before building your Amazon SimpleDB application.