Answer Description

A blacklist is a list of things that are not allowed and should be blocked. So an application blacklist is a list of applications that are blocked from being installed or run. Blocking commonly used applications that are not work-appropriate would be a good start to solving this issue and ensuring your boss doesn't fire you. How to implement application blacklist depends in on the devices and operating systems used in your organization but is generally possible on most common operating systems or with 3rd party device management solutions.

Wikipedia

In computing, a blacklist, disallowlist, blocklist, or denylist is a basic access control mechanism that allows through all elements (email addresses, users, passwords, URLs, IP addresses, domain names, file hashes, etc.), except those explicitly mentioned. Those items on the list are denied access. The opposite is a whitelist, allowlist, or passlist, in which only items on the list are let through whatever gate is being used. A greylist contains items that are temporarily blocked (or temporarily allowed) until an additional step is performed. Blacklists can be applied at various points in a security architecture, such as a host, web proxy, DNS servers, email server, firewall, directory servers or application authentication gateways. The type of element blocked is influenced by the access control location. DNS servers may be well-suited to block domain names, for example, but not URLs. A firewall is well-suited for blocking IP addresses, but less so for blocking malicious files or passwords. Example uses include a company that might prevent a list of software from running on its network, a school that might prevent access to a list of websites from its computers, or a business that wants to ensure their computer users are not choosing easily guessed, poor passwords.