The Internet of Things (IOT) describes a kind of network which interconnects various devices with the help of internet. IOT assists to transmit data with among devices, tracing and monitoring devices and other things. IOT make objects 'smart' by allowing them to transmit data and automating of tasks, without lack of any physical interference. A health tracking wearable device is an example of simple effortless IOT in our life. A smart city with sensors covering all its regions using diverse tangible gadgets and objects all over the community and connected with the help of internet. This word IOT was first suggested by Kevin Ashton in 1999. The subsequent segment represent fundamental of IOT. It hands out several covering pre-owned in IOT and varied fundamental denominations connected. It is primarily enlargement of helping-hand using Internet. When the household devices are connected with the help of internet, this can help to automate homes, offices or other units using IOT. IOT is being used during COVID-19 pandemic for contact tracing.