The Internet of Things (IoT) is the broad network of physical objects that carry sensors and an internet connection, so they can send and receive data without a person typing anything in. A thermostat, a delivery van, a coffee machine, a heart monitor: once it talks to the internet, it joins the IoT.
Think of a vending machine that texts the supplier when it runs low on a popular drink. Nobody walks past to check the shelves. The machine counts its own stock, notices the gap and reports it, all on its own. That same idea scales up to thousands of sensors on a production line, each one streaming numbers that software reads in real time. Most of those devices speak to your systems through an API and exchange small packets of data, often formatted as JSON, because it is light and easy for any platform to read.
The value is not the device. It is what you do with the data it sends. A pattern in the numbers can warn you that a motor is about to fail, or that a freezer is drifting out of range, days before it becomes an expensive problem.
Security is the part teams underrate. Every connected device is a door into your network, and a cheap sensor with a default password is an open one. Keeping firmware updated, encrypting traffic and isolating devices on their own network is the difference between a useful tool and a quiet liability.
There is a scale problem too. A thousand sensors each sending a reading every second is a flood of data, and most of it is noise. The real engineering is deciding what to keep, what to act on, and what to safely throw away.
At TopDevs we build the software layer that collects, cleans and acts on IoT data, so the readings from your devices turn into alerts and decisions instead of noise.
