A radio format or programming format describes the overall content broadcast on a radio station. This article is about radio broadcasting for other uses see Radio (disambiguation. Radio formats are frequently employed as a marketing tool, and constantly evolve. In popular usage "marketing" is the promotion of products especially Advertising and Branding However in professional usage the term has a wider meaning of Music radio; Old Time Radio, All-news radio; Sports radio; Talk radio and Weather radio describe the operation of different genres of radio format and each format can often be sub-divided into many speciality formats. Music radio is a radio format in which Music is the main broadcast content Old-Time Radio (OTR and the Golden Age of Radio refer to a period of Radio programming lasting from the proliferation of radio broadcasting in the early 1920s until All-news radio is a Radio format devoted entirely to discussion and broadcast of News. Sports radio (or sports talk radio) is a Radio format devoted entirely to Discussion and Broadcasting of sporting events. Talk radio is a Radio format containing discussion about topical issues A weather radio service is a broadcast service which airs special weather-related emergency broadcasts and announcements