You get a pad, you drive over it, stop, and it starts charging.
I looked at a Tesla Model S version, which is coming out this month, and it charges at roughly 72% of the plug-in version (7.2kW vs 10kW) https://www.pluglesspower.com/shop/reserve-tesla-model-s/.
Not a bad efficiency for wireless charging at all.
Currently, they support Nissan Leaf, Tesla Model S, Chevy Volt, and Cadillac ELR but working on more, like Model 3.
In 10 years, we'll look back at today's cars and wonder how we ever drove these gasoline monstrosities that need gas stations and don't just charge at home wirelessly.