In the publishing industry, the term "stock" refers to a specific type of paper used for printing. It determines the thickness or weight of the paper, which in turn affects the overall look and feel of printed materials such as books and magazines.

Thicker stock gives a sturdier and more substantial feel, while lighter stock feels thinner and lighter. 

Cardstock
Cardstock is a heavy and durable type of paper that is commonly used for crafting, printing invitations, making greeting cards, or creating sturdy packaging. It is thicker and stiffer than regular paper, providing a more substantial and professional feel to projects.

Gloss Book & Cover
Gloss book is comparable to the type of paper you might find within magazines as the main pages. Gloss cover, on the other hand, is comparable to the cover of the magazine, where it is slicker thicker and more durable. 

Matte Book
Matte Book is a thinner type of paper, that will feel like a slightly heavier standard printing paper. 

Matte
A matte coating is a finish applied to printed materials that creates a non-glossy, smooth surface, resulting in a muted and velvety appearance.

Glossy
A glossy coating is a finish applied to printed materials that creates a shiny, reflective surface, enhancing the vibrancy and richness of colors.

Semi-Gloss
A semi-gloss coating is a finish applied to printed materials that strikes a balance between matte and glossy, providing a moderate level of shine and smoothness.

No Coating
No coating, as opposed to matte, has no extra coating applied to the paper it is printed on.