A Smart light dimmer switch is a WiFi enabled switch designed to replace an existing light switch panel on your wall and does not require a smart home hub.
Customers can either control their switches through their smart phone app or through Google Home hub or Amazon Alexa voice control.
Many smart switches provide the ability to dim the light bulbs attached to the circuit.
If this is one of your requirements, make sure to confirm your chosen smart dimmer switch has this desired functionality.
One major thing to remember, however, is that although a smart dimmer switch will allow you to dim your lights, your smart light bulbs must be capable of dimming for things to work.