iPhone or iPad
Recent TVs support Apple's Airplay (as well as the Apple TV) that let you stream from your iPhone or iPad to to the TV. Check out this handy support article from Apple on details.

Amazon TV Fire Stick
Amazon's Fire Stick supports Airplay to let you project your screen from iPad or iPhone to it.

Roku
Roku devices have a feature called Screen Mirroring that lets you put the video on fullscreen from Android or Windows Devices. Check out the instructions here.

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