Level 1 charging simply involves plugging your EV into a standard wall outlet with the provided charging cable. This can take up to 24-hours to fully charge a modern EV depending on the size of the battery and range of the vehicle. Level 2 charging usually requires some electrical work but provides for significantly faster charging.
There are two types of Level 2 charging installations. One is simply a special high voltage outlet, like what large appliances use, the other includes a specialty charging device. Both do the job, but the charging device gives you more options and control. These devices are often required to capture utility incentives.