Netscape Plugin Application Programming Interface (NPAPI) was an application programming interface (API) of the web browsers that allows plugins to be integrated. Initially developed for Netscape browsers, starting in 1995 with Netscape Navigator 2.0, it was subsequently adopted by other browsers. NPAPI was frequently used for plugins which required intensive, low-level performance such as video players, including Adobe Flash Player and Microsoft Silverlight, as well as platforms for web applications such as the Java Runtime Environment.