Resin is a hydrocarbon secretion of many plants, particularly coniferous trees. It is valued for its chemical properties and associated uses, such as the production of varnishes, adhesives, and food glazing agents; as an important source of raw materials for organic synthesis; and as constituents of incense and perfume.

1. Gum Rosin:
Rosin, also called colophony or Greek pitch (Pix græca), is a solid form of resin obtained from pines and some other plants, mostly conifers, produced by heating fresh liquid resin to vaporize the volatile liquid terpene components. It is semi-transparent and varies in color from yellow to black. At room temperature rosin is brittle, but it melts at stove-top temperatures. It chiefly consists of different resin acids, especially abietic acid.

2. Ion Exchange Resins:
An ion-exchange resin or ion-exchange polymer is an insoluble matrix (or support structure) normally in the form of small (1–2 mm diameter) beads, usually white or yellowish, fabricated from an organic polymer substrate.

There are four main types differing in their functional groups:
● strongly acidic (typically, sulfonic acid groups, e.g. sodium polystyrene sulfonate or polyAMPS)Resins
● strongly basic, (quaternary amino groups, for example, trimethylammonium groups, e.g. polyAPTAC)Resins
● weakly acidic (mostly, carboxylic acid groups)Resins
● weakly basic (primary, secondary, and/or ternary amino groups, e.g. polyethylene amine)Resins

There are also specialised types:
● chelating resins (iminodiacetic acid, thiourea, and many others)