Lecithin is commercially available from soy, sunflower seed, rapeseed and corn oil. The ordinary and most pure form is known as a W/O emulsifier but it can do much more than that. It is a skin feel and penetration enhancer and a fragrance stabiliser.
Lysolecithin which is the emphatically hydrolyzed lecithin is more hydrophilic that the virgin lecithin and is used as an O/W emulsifier.
Then there are hydrogenated lecithin and lysolecithin as well. These are just a few varieties of lecithin.
How do you like/use lecithin in your products?