Like many phone-based application stores, the
Android Market is a catalog of applications that can be downloaded and installed to target hardware over-the-air, without the use of a PC. Originally only free applications were supported. Paid-for applications have been available on the Android Market in the United States since 19 February 2009.
[49] The Android Market has been expanding rapidly. By March, 2010, it had over 30,000 Android applications for download