Flexible antennas are one of the majorly used transceiver devices in modern day technologies. Due to its flexible nature it can be used ranging from healthcare industry to automobile industry, and many more. Study and analysis on flexible antennas have unveiled new dimensions in communication network and allied domains. Compact, lightweight, flexible materials make sure that the antenna can be used along with any existing electronics of any required shapes. Mainly the polymers, textiles and papers are being used as antenna substrates to incorporate flexibility. In recent times, flexible antennas are analysed vastly for futuristic bio-implantable antennas. Along with the flexible dielectric materials, conducting flexi materials are also investigated to replace the radiating portion of the antenna. A detailed review on flexible antennas by comparing on the basis of materials used and the applications, may find some interesting alternatives of the conventional applications. Also, this review work shall unearth the possibility of new fan outs of futuristic approaches.