What is ECR passport

What is ECR Passport:

If you are subject to ECR, emigration clearance from POE to enter any of the following countries for employment is required:
Afghanistan
Bahrain
Brunei
Kuwait
Indonesia
Iraq (emigration banned)
Jordan
Lebanon
Libya
Malaysia
Oman
Qatar
Sudan
Syria
The Kingdom of Saudi Arabia (KSA)
Thailand
United Arab Emirates (UAE)
Yemen
Effective October 1, 2007, if you are traveling to any of the above countries for purposes other than employment, you require emigration clearance.
If you are traveling to any country other than those mentioned above, you don't require emigration clearance.