What causes my computer to crash dump?

Every so often my computer will do a crash dump where the system crashes and comes up with a blue screen and restarts my computer. After these occur some things happen to my system to stop it working correctly. What causes it to crash dump and is it serious?

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VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).