Polysaccharide is one of the most ancient and vast research field among natural sustainable biopolymers and they are readily available in nature as an essential component of our daily food. Hence, distribution of the entire field into some important factor-based classification like physical structure, stability, solubility become mandatory for clear understanding of whole polysaccharide chemistry. In some past decades, scientists mainly focused on general laboratory synthesis of this biopolymers with potential applications. Then, they broadened their vision to classify polysaccharide based composite materials and hydrogels based on majorly available polysaccharides in nature. Those gels are separated from entire polysaccharide based soluble biopolymers due to their three-dimensional physical or chemical crosslinked structure and hydrophilic, polymeric frameworks. But, a more compile classification was needed for better understanding of synthetic approach for those biodegradable hydrogels and their applications. Introducing gel porosity-based classification is a novel approach facilitating to understand the gel structure. The review mainly focused the recent advancement of polysaccharide-based gels with targeted porosity.