Gestyy.com is a dubious advertising domain that is being associated with unwanted and intrusive redirects. In the vast majority of cases, users do not land on Gestyy.com willingly. Instead, they are taken there either through a forced redirect caused by a previously visited website or due to the presence of an adware application on their computers.
If you see the Gestyy.com page only once in a while, then you can simply use an ad-blocker program to stop it and other dubious domains from creating such forced redirects. If Gestyy.com is popping up quite frequently, however, that might a sign for the activity of an adware application.
Applications of this type are designed to install themselves without attracting the attention of the user by employing deceptive marketing tactics such as bundling or hiding inside a fake installer or updater for a popular software product. Users should abstain to engage with any of the advertising materials generated by the Gestyy.com website, as they could lead to untrustworthy third-party pages.
It is not uncommon for the advertisements to redirect to domains dedicated to spreading additional adware or browser hijacker applications, conducting various online tactics such as phishing, or even attempting to drop serious malware threats onto the user's computer.
The best way to make sure that your system is clean from all PUPs (Potentially Unwanted Programs) is to perform a scan with a reputable anti-malware solution.