You might be asking yourself, what exactly is glycosylation? Glycosylation is the adding of a glycoside (sugar) to a protein. This process occurs in the endoplasmic reticulum (ER), while the polypeptide is still being biosynthesized and is partially unfolded. This suggests that glycosylation plays a role in protein folding and stability. Glycosylation is one of the most common and important protein modifications. 
(The image above shows O-linked glycosylation)
This article basically talks about the process of glycosylation and its glycoproteins. A glycoprotein is formed when a membrane associated carbohydrate is exclusively in the form of oliogsaccharides covalently attached to proteins. Glycoproteins consist of proteins covalently linked to a carbohydrate.
(The image above shows N-linked glycosylation)
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