In wearable technology, wearable devices are smart gadgets that can be worn near or potentially over the skin, where they distinguish, explore, and send the concerned data like- body gestures or signals, such as imperative signs, or potentially surrounding information and which provides immediate bio-feedback to the wearer in some cases. Wearable innovation has a lot of utilizations that develop as the field itself grows. It shows up conspicuously in consumer gadgets with the promotion of the movement tracker and smartwatch. Aside from business utilizations, wearable technology is being fused into routing frameworks, progressed materials (textile), and medical care. This paper describes the most used wearable technology and sensors, wearable computing, working and architecture of wearable, various application, user preferences, and key challenges with the wearables