There are many reasons for flush DNS cache from your PC, most common is an error on websites.
Like suddenly some website is showing error and not loading successfully then it might be the DNS cache or even sometimes using any VPN you get the error from some streaming services is also could be the DNS cache.
However, you don’t need to be a geek to clear the DNS cache. All you need a simple command to run and then it’s done.
Goto windows start Menu.
Search for CMD.
And type ipconfig /flushdns
But some peoples claims that they don’t have CMD instead that have Powershell
So using PowerShell you can also do that same.