Printing inks are colored liquids or pastes used in various printing processes to transfer images and text onto surfaces like paper, plastic, or fabric. They are made from a combination of pigments or dyes, solvents, and additives that help control drying time, viscosity, and adhesion. Different types of inks are designed for specific printing methods, such as offset printing, flexography, or screen printing. The choice of printing ink can significantly affect the quality and durability of the printed material. For example, water-based inks are often used for their eco-friendliness, while solvent-based inks provide better resistance to fading and weathering. Understanding the properties of each type helps printers achieve the desired results for their projects.