Entertainment is a form of activity that holds the attention and interest of an audience or gives pleasure and delight. It can be an idea or a task, but is more likely to be one of the activities or events that have developed over thousands of years specifically for the purpose of keeping an audience's attention. Audience applauding a performance of Cavalleria Rusticana by Pietro …

Sierra Entertainment was founded in 1979 as On-Line Systems in Simi Valley, California, by husband-and-wife Ken and Roberta Williams.Ken, a programmer for IBM, had planned to use the company to create business software for the TRS-80 and Apple II. Ken had brought a teletype terminal home one day in 1979, and while looking through the host system's catalog of …