VLC Media Player Portable is an Open Source app that plays most audio and video formats and various streaming protocols. Available as an installer. Video tutorial available.
VLC Media Player doesn't need any external codec or program to work.
Windows 10 comes with a mediocre DVD player, leaving many people wondering what to use and often being steered towards shareware on the Windows Store. VLC Media Player does what you want for free.
You can choose file associations, web plugins, file associations, context menu items, and a few more during the installation. It installs very quickly, usually within a minute. VLC does not transmit or collect any personal data, but it can retrieve information about your media if you like. You are given the option to do this or opt out immediately after installation. You can also change this later under Tools, Preferences.
VLC can easily play all of your audio and video, is easy to use. Still, more importantly, it includes a wealth of other features, including no need for codecs, streaming, skins, plugins, conversions, and much more.
VLC Media Player can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.