Explanation
A wildcard certificate is a type of SSL certificate that can secure multiple subdomains under one domain name by using an asterisk (*) as a placeholder for any subdomain name. For example, *.company.com can secure www.company.com, contactus.company.com, quotes.company.com, etc. It can work for all the existing applications and any future applications that follow the same naming conventions, such as store.company.com.

a watering hole attack is a form of cyberattack that targets a specific group of users by infecting websites that they commonly visit123. The attacker seeks to compromise the user's computer and gain access to the network at the user's workplace or personal data123. The attacker observes the websites often visited by the victim or the group and infects those sites with malware14 . The attacker may also lure the user to a malicious site4. A watering hole attack is difficult to diagnose and poses a significant threat to websites and users2 .