Why does hexadecimal exist?

1101010 is kinda hard to read. It's very long and you have to do a lot of calculating to find out the actual number:

1 1 0 1 0 1 0
2^6=64 2^5=32 2^4=16 2^3=8 2^2=4 2^1=2 2^0=1
64 32 0 8 0 2 0


If we add this up we get 64 + 32 + 8 + 2 = 106.  So 1101010 is 106 in decimal. Wow this took a long time (you might not even get it yet).