Here’s my take on this.
MIMO, or Multiple-Input, Multiple-Output, is a clever way for wireless devices to handle more data. Think of it as adding more lanes to a data highway. Instead of a single stream of data, a MIMO-enabled router uses multiple antennas to send and receive several data streams simultaneously.
The primary benefit is a boost in both speed and reliability. More streams mean higher throughput, which you perceive as faster Wi-Fi. On the other hand, the system can also use those multiple antennas to combat interference and signal degradation, making your connection more stable and robust, even at a distance.
While it’s a standard feature on most modern Wi-Fi routers (Wi-Fi 5 and newer), it’s not universal, especially on older or budget models. For it to work best, both your router and your device (phone, laptop, etc.) need to support it.