How Many Different HDMI Connectors Are There?
HDMI uses five main connector types: Type A, B, C, D, and E, each for different applications - these include the standard connector as well as the mini-HDMI and micro-HDMI
Essentially, it all comes down to bandwidth: The current bandwidth capacity for HDMI 2.0 is 18Gbps, but HDMI 2.1 clocks in at a robust 48Gbps. This increase in bandwidth allows HDMI 2.1 to transfer way more information. In a nutshell, this means higher-resolution video and higher frame rates
HDMI ports are usually either inputs or outputs. The simple difference is that if the device receives a signal – like a computer monitor – it will have an HDMI input. And, if it sends a signal – like a Blu-ray player – it will have an HDMI output