Many of the first computers did not have a storage device where to save the information and the applications, in this way all the information was in the RAM all the time, and this information was deleted every time the pc was turn off. (We must remember that the RAM, is a kind of memory volatile, also known as work memory because is available to use when the pc is turn on)
The RAM or Random Access Memory is the work memory, where all the programs and data information that are open in a defined moment is loaded. The RAM only stores data information when the computer is on, when we computer is off the information on the RAM is cleared.
Eclipse ha sido ampliamente reconocido por su IDE para Java, sin embargo en la actualidad, Eclipse es mucho mas que eso, tambien tiene IDE para C, C++ y PHP, ademas de muchas otras herramientas y plugins.
Android Studio is the Google official IDE for Android Apps development, providing fastest tools with a lot of features: Visual Layout Editor, APK Analyzer, Fast Emulator, Intelligent Code Editor, Flexible Build System, Realtime profilers, thousands of learning videos and blogs, an more.