Explanation:

The cost of access to space is the major deterrent in space exploration and space utilization. A reusable launch vehicle is the unanimous solution to achieve low cost, reliable and on- demand space access.
Reusable Launch Vehicle-Technology Demonstration Program or RLV-TD is a series of technology demonstration missions that have been considered as a first step towards realizing a Two Stage To Orbit (TSTO) fully re-usable vehicle.
A Winged Reusable Launch Vehicle technology Demonstrator (RLV-TD) has been configured to act as a flying test bed to evaluate various technologies, namely, hypersonic flight, autonomous landing, powered cruise flight and hypersonic flight using air-breathing propulsion.
These technologies will be developed in phases through a series of experimental flights.