On occasion, you may want to save a preset for a component, this is a default Unity feature, and will allow you or other users to access a predefined set of values for any given component. This is especially useful for saving and loading default values for asset components, if a user would like to load them for example.
To save a preset, you can use the preset icon in the top left of any component window.
From here, you can save a preset to a file, or load an existing preset