what is the blink function

Hi. Whenever I type the word "blink" it turns red, suggesting that it is a function. Yet I cannot find any reference for this. What is this and how does it work? thanks

Please try rewording your request for help.

If you are referring to a sketch you have:

Always show us your ‘current’ compete sketch.
Use CTRL T to format the sketch.
Please use code tags.
Use the </> icon in the posting menu.

[code] Paste sketch here. [/code]

awesome. thank you