What is adb in Android?

Issue

I get the following errors when I try to run my Android program.

Please explain me What really adb is, and how to restart it?

I am getting the following error

The connection to adb is down, and a severe error has occured.
You must restart adb and Eclipse.

Solution

adb is Android Debug Bridge.

To restart adb by command line:

adb kill-server
adb start-server

To restart adb in Eclipse:

1. Window > Show View > Other... > Android/Devices
2. When the view is showing: View Menu of "Devices" > Reset adb

Answered By - Hailei