A color picker is a tool used to select and define colors for digital designs, graphics, and applications. It is also known as a color selector or color chooser. Color picker tools come in different forms, from simple web-based applications to complex software applications used by professional graphic designers.

The basic functionality of a color picker is to allow users to choose a specific color value, usually in a hexadecimal format, to use in their digital design or application. This value can be selected by either inputting the hexadecimal value directly or by selecting a color from a graphical user interface.

Some advanced color picker tools also allow users to create custom color palettes, save colors for later use, and adjust colors using various algorithms, such as hue, saturation, and brightness. Some color picker tools also include features such as eyedroppers, which allow users to select a color from an image or web page.

Overall, color picker tools are essential for designers and developers who require precise control over the color choices in their designs and applications.