Raster and vector layers

Using Corel PSP X
Can some one explain the difference in a Raster and Vector layer. I read the help and it wasnt much help.
Also just curious if you guys change the name of your layers.
Thanks
Pk
Can some one explain the difference in a Raster and Vector layer. I read the help and it wasnt much help.
Also just curious if you guys change the name of your layers.
Thanks
Pk