The Full Form of RAPID is Re-organised Army Plains Infantry Divisions.

Any army has to play several roles on the different arenas of land, water and on air. Unlike mainly the infantry units takes days for deployment, and can be used for combat situations (Strike Corps). RAPID infantry units are all war readiness and deployment along with extensive strike power at short notice.
RAPID is an acronym for Re-organised Army Plains Infantry Divisions. RAPID is the brainchild of Gen. Krishnaswami Sundarji, one of the India’s most brilliant, ambitious and controversial chief of army staff. In 1976 Sundarji became the first infantry officer to command an armoured division. During his tenure he realised his ambition of raising the desperately needed mechanised infantry regiment. Sundarji took this forward in the ’80s to shape the army’s perspective, the Army Plan 2000, which outlined a new mobile strategy based on tanks, firepower and enhanced communications.
Reorganised Army Plains Infantry Division (RAPID) formations have three brigades – two mechanised infantry and one armoured. Four infantry divisions were converted into the Reorganised Army Plains Infantry Division. They have Night fighting capabilities, which have been enhanced through third generation passive devices and thermal imaging systems. Including others they also have Sophisticated VHF and HF equipment which have developed to produce jam resistant frequency hopping sets while different kinds of indigenous radar will boost the air defence and artillery capabilities. These RAPID divisions were essentially infantry divisions with one mechanized brigade which would give the division greater mobility. The division has various force multipliers and surveillance systems.
Thus, this division is all time ready with extensive strike power with latest technologies besides Mechanised and armoured divisions. They are one of the first units to call in war situations, with high mobility and fighting capabilities.

Needless to say, the Army is waiting in vain, for the financial resources for more advanced technological makeover to being in par.