What are native & invasive plants?

Last night our master gardener class topic was native and invasive plants. This is an area that I’m really interested in, so expect to see a lot of posts about this! I’m hoping a native and/or invasive plant volunteer project gets formed so I can participate. I have to make this a short post–so I thought I’d start out simply by defining native & invasive plants. Much more on this later so please come back.