What are web bugs and how do they "track" your activity online?

= CREDITS =
NB: Outtro theme was made in-house. All rights reserved.

My appreciation extends to the creators of the following external assets that made this video possible:
Blown Away by Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/
ISRC: USUAN1200100

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