They are groups of letters given a special purpose which is to inform the user about the region or country the website is based in. They are a part of the website’s URL and generally referred to as ‘country-code’ TLDs. A few examples are google.co.uk for Google UK and com.au for any website based in Australia. They can either be sets of two letters each or even be two sets of letters with a period in between, such as in the case of com.au. Using CCTLDs correctly can prove to be a big boost for search engine optimization as it allows developers to target their content as per the country involved. Although having said that, there are designated subdirectories or country-focused subdomains which can be used to target foreign countries.