Difference between DDR3 RAM PC3-10600S vs PC3-10600

I am trying to upgrade my RAM of my HP G62-b51SE and found that the stock RAM type is DDR3 PC3-10600S.

I am trying to find the difference between that (PC3-10600S) and PC3-10600.

S stands for SODIMM, meaning the RAM is for laptop.

Following on from Grace's answer, this link What's the difference between DDR3 1333 MHz PC3-10600S and DDR3 1333 MHz PC3-10600 states:

To answer you actual question correctly. The "S" as in DDR3 10600S for example stands for SO-DIMM which is the size of RAM for Laptops. If you had desktop memory the same RAM would say DDR3 10600. Crucial and other companies have a way of not listing the RAM speed with the "S' because in the title of the RAM you are purchasing it says "SO-DIM' but when you get your RAM it will have the "S" on it if you are buying for a laptop.