MIMO stands for multiple input, multiple output. It is a wireless technology that uses multiple antennas on both the transmitter and receiver to send and receive several data streams at the same time over the same frequency channel.
Traditional single-antenna wireless systems can only transmit one stream of data. MIMO breaks that limit. By adding more antennas and using clever signal processing, MIMO allows a router or phone to handle more data without needing extra bandwidth. The result is faster speeds, better range, and fewer dropped connections.
You will find MIMO in Wi-Fi routers (especially 802.11n, 802.11ac, and Wi-Fi 6), mobile phones, and some laptops. A router labelled 2x2 MIMO has two antennas for transmitting and two for receiving. A 4x4 MIMO router has four of each. The more antennas, the higher the potential throughput.
Real-world example: A 4x4 MIMO Wi-Fi 6 router can deliver faster speeds and more stable connections than an older single-antenna model, especially when multiple devices are connected nearby.
When shopping for a router, check the MIMO configuration listed in the specs. If you have a crowded household with many wireless devices, a router with 4x4 MIMO or higher will handle congestion better than a 2x2 model. Phones and laptops with MIMO support will also make better use of a MIMO-equipped router.