Printing inks are colored liquids or pastes used in the printing process to transfer images and text onto various surfaces, such as paper, plastic, and fabric. They are made from a combination of pigments or dyes, solvents, and additives that help improve their performance and durability. There are different types of printing inks, including water-based inks, solvent-based inks, and UV inks, each suited for specific applications. The choice of ink affects the quality, drying time, and environmental impact of the printed material, making it essential for printers to select the right type for their projects.