The science of Numerology looks at people's full name at birth, the name they go by now and their full date of birth, giving us some insight into who that person is: his or her personality makeup, future forecast and much more. However, that is only the beginning. From a broader perspective, Numerology is a science of patterns and numbers as they affect us in every area of life, including home addresses, phone numbers, compatibility of relationships and much more. For now, though, let's talk about its practical use in trying to understand and improve ourselves.
Your full name at birth represents the talents, abilities, shortcomings and attributes with which you are equipped to use during your lifetime. It is the blueprint of who you are. A Numerologist will look at each of the letters in a person's name, the order in which they appear, the sum of their numerical value (each letter has a numerical value) and other aspects to get a sense of who that person is. And the insight gained from that is significant and revealing.
The name you go by today -- the way you introduce yourself (often, but not always, a shorter version of your full name) -- tells how you view yourself; who you think and understand yourself to be.
And, arguably the most important source of insight in Numerology, is your date of birth, which reveals the path you are on, the direction of your life, the opportunities and challenges you encounter on your path, the cycles and so forth. A Numerology future forecast is mostly based on the numbers in your date of birth.
Numerology is similar in many ways to Astrology -- it's simply a different method of insight and offers a somewhat different view.