A cookie is a small file that is placed on your computer's hard drive. The cookie helps analyse web traffic and is sometimes used for authentication. Cookies also allow web applications to respond to you as an individual. The web application can tailor its operations to your needs, likes and dislikes by gathering and remembering information about your preferences.
A cookie in no way gives us access to your computer.
You can choose to accept or decline cookies. Most web browsers automatically accept cookies, but you can usually modify your browser setting to decline cookies if you prefer. This may prevent you from taking full advantage of the website.