Cookies are small data sent and stored on the hard drive of the user's computer by your browser when it connects to a website.
Cookies can be used to get and store user data while connected to provide requested services and that usually does not preserve (session cookies) or to retain user data for other future services that can be retained indefinitely (persistent cookies).
In codiobert.es use "cookies analysis" own and others to analyze anonymous the behavior of web users, to measure user activity profiling and navigation in order to improve the website.
In any case the cookies used treat personal data.
You can set your browser to refuse to store cookies on your computer.
Here are some links on how to disable cookies from browsers: