The PowerMac line of computers was a series of desktop computers that ran from March 1994 to August 2006, 10 years.  It was most successful at the end of the 90s, and into the 2000s, it was one of the two lines that apple offered until it got into mobile items.  And it was least successful in the 90s like the rest of Apple. Apple ended its PowerMac line in 2006 because the need and use of desktops for consumers were declining.  Only professionals need the extra power of a desktop anymore, and Apple would lose money if they had a to support a mainstream line of desktops.  Apple had many different versions of the computers, and you can probably think of them as the more consumer aimed Mac Pros of today.