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Ink is a liquid or paste that contains pigments or dyes and is used to color a surface to produce an image, text, or design. Ink is used for drawing or writing with a pen, brush, or quill. Thicker inks, in paste form, are used extensively in letterpress and lithographic printing.
Ink can be a complex medium, composed of solvents, pigments, dyes, resins, lubricants, solubilizers, surfactants, particulate matter, fluorescents, and other materials. The components of inks serve many purposes; the ink’s carrier, colorants, and other additives affect the flow and thickness of the ink and its dry appearance. However in the Naruto verse base ink is considered to be just that, nothing special really. It's essentially a colored water, that is until an expert user of ink release begins to use it. Then it becomes a powerful tool that can bring drawings and art the user forms to life allowing the ink drawings to fill a variety of roles such as basic attacking, transporting or reconnaissance, even the sealing of other people at high levels. Ink differs from most skill sets because it requires no handseals for the most part but instead requires the user to draw the creatures they wish to summon forth with larger creatures presumably taking longer to draw.