Provides a standard way for storage devices to connect to a computer
The controller for the IDE is usually integrated into the disk or CD-ROM drive, and the controller directs how the hard drive stores and accesses data.
IDE was created as a way to standardize the use of hard drives in computers by combining the controller and the hard drive because having separate controllers and hard drives resulted in poor signal quality and performance.
In 1984, IBM introduced the AT computer with a hard drive had a combined drive and controller. A ribbon cable from the drive/controller combination is used to connect to the system unit, creating the AT Attachment (ATA) interface.
Soon, other vendors started offering IDE drives based on the ATA standard developed by IBM. Thus, IDE became the term that covered the entire range of integrated drive/controller devices. Because almost all IDE drives are ATA-based, the two terms are used interchangeably.