The Azure Storage platform exposes two REST APIs that allow you to operate on it, one for service management and the other for dealing with each service specifically. These APIs allow developers to interact with and consume the storage services programmatically from applications. The platform also offers multiple client-side libraries for application, under open source licenses that encapsulate the functions of the REST APIs in a higher level code. These libraries target most of the major programming platforms. This chapter will be centered on the different APIs available, and then on the major client libraries available.