Life path numbers are said to be when you add up your birthdate for example (random birthday)

December 2, 1980

12 - 2 - 1980

1+2+2+1+9+8+0 = 23

so 2+3 = 5

Life path number = 5

There's a lot on it ...kind of like the zodiac

Here's one site:
http://www.astrology-numerology.com/num-lifepath.html#9


Mine is 9.

that's deep. i'm a 2.