Fulfillment of the law?

What does it mean by Jesus came and fulfilled the law? How does one fulfill a law?

Fulfill means to complete something:

1. To bring into actuality; effect: fulfilled their promises.
2. To carry out (an order, for example).
3. To measure up to; satisfy.
4. To bring to an end; complete

Jesus gave two new commandments that basically said that if one truely loves then they will not be able to break the ten commandments:

Mt 22:35 Then one of them, which was a lawyer, asked him a question, tempting him, and saying,
36 Master, which is the great commandment in the law?
37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
38 This is the first and great commandment.
39 And the second is like unto it, Thou shalt love thy neighbour as thyself.
40 On these two commandments hang all the law and the prophets.

Fulfill does not, however, mean to do away with, although there will be many that disagree.

Ro 13:8 Owe no man any thing, but to love one another: for he that loveth another hath fulfilled the law.
9 For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself.
10 Love worketh no ill to his neighbour: therefore love is the fulfilling of the law.

Mt 5:17 ¶ Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.

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Galations 2:20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.