Why do movies have black bars?

Today we look at why black bars (also know as letterboxing or widescreen bars) first began to appear above and below movies and why the style has remained until today. Also my hair is different. If you enjoy the video, leave a like and share it on Facebook/Twitter!
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Camera/lens: Nikon d5100/Nikkor 50mm f/1.8D
Microphone: Rode VideoMicro
Software: HitFilm 3 Pro
Stuff used in this video:
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Music:
Instrumental by ChukiBeats [ / chukimusic ]
W-FU !!! - Arigato! [ • W-FU !!! - Arigato! (P... ]
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Images:
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Sound effects:
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Fonts:
Modeka
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