What is adb in Android?

Question

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.

Answer 1

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

Answer 2

Android Debug Bridge

Android Debug Bridge (adb) is a versatile command line tool that lets you communicate with an emulator instance or connected Android-powered device. It is a client-server program that includes three components:

• A client, which runs on your development machine. You can invoke a client from a shell by issuing an adb command. Other Android tools such as the ADT plugin and DDMS also create adb clients.
• A server, which runs as a background process on your development machine. The server manages communication between the client and the adb daemon running on an emulator or device.
• A daemon, which runs as a background process on each emulator or device instance.

Restarting ADB

adb kill-server && adb start-server

By using above command, that'll restart the adb server. And, if you're using Eclipse means, please see the below image -

In your DDMS one option is there for restarting the adb like in above image. Hope this helps you.