IDE

1. Short for Integrated Drive Electronics or IBM Disc Electronics, IDE is more commonly known as ATA and is a standard interface for IBM compatible hard drives. IDE is different from the Small Computer Systems Interface (SCSI) and Enhanced Small Device Interface (ESDI) because its controllers are on each drive, meaning the drive can connect directly to the motherboard or controller. IDE and its updated successor, Enhanced IDE (EIDE), are the most common drive interfaces found in IBM compatible computers today. Below is a picture of the actual IDE connector and cable.
   
   
   
   Additional information about IDE and other computer interfaces can be found here.
   
2. Short for Integrated Development Environment, IDE also sometimes referred to as IDLE, IDEs are visual tools that allow programmers to develop programs better. Commonly, an IDE may have a compiler, debugger, text editor, and other integrated tools. Smalltalk was the first programming language to have a first true IDE. 

Also see: .NET, Bus, EIDE, Hard disk drive definitions, Motherboard definitions, Programming definitions