What is input lag?
How input lag works
Input lag is caused as follows: each image is generated by a source, like a console. After that, this image is sent to your TV by wire or wirelessly, processed, and shown on the screen. This entire process takes up a couple of milliseconds. The exact number differs per TV. There are televisions that only have a 20ms input lag, but there also TVs with an input lag of 100ms. The higher the input the lag, the bigger the delay.
The importance of a low input lag
The input lag of a TV is only important when playing video games. When gaming, there's a small delay between the controller and the action on the screen. This can negatively affect different types of games. Think of a racing game, during which you take a corner at the very last moment. If the game registers your action too late, you'll crash into the guardrail. With a shooter, you're at a disadvantage if the opponent sees you first and is quicker to react.