In Direct Airside Transit Visa applicable when you arrive on a flight, remain in the arrival lounge of the airport without passing through immigration control, and then depart on another flight from the same airport.
The UK government operates a DATV system for some countries.These countries are here
If you are a national of a from any of these countries(to know the country list click here) you must have a Direct Airside Transit Visa to perform a Air side Transit in UK
Government of India has launched electronic travel authorisation or eTA for India which allows citizens of 180 countries to travel to India without requiring a physical stamping on the passport. This new type of authorisation is called an eVisa India (or electronic India Visa). It is this electronic India Visa Online that allows foreign visitors to visit India for five major purposes, tourism / recreation / short term courses, business, medical visit or conferences. There are further number of sub-categories under each visa type.
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