If I may summarise what I gathered from this thread:
Unicode assigns characters to ordinal numbers (in decimal form). (These numbers are called code points.)
à -> 224
UTF-8 is an encoding that 'translates' these ordinal numbers (in decimal form) to binary representations.
224 -> 11000011 10100000
Note that we're talking about the binary representation of 224, not its binary form, which is 0b11100000.