Here is a brief description:
First, God has a name which he made known to Abraham and his descendants who later stopped pronouncing it due to becoming superstitious and in that way its original exact pronunciation was lost. His name is represented by four Hebrew consonants and we do our best to fill in the sounds. One attempt at pronouncing HIS name is the example below.
Psalm 83:18
That men may know that thou, whose name alone is JEHOVAH, art the most high over all the earth. KJV
CATHOLIC ENCYCLOPEDIA: Jehovah (Yahweh)
The Church of Yahweh
Why We Must Know God's Name - Jehovah's Witnesses Official Web Site
The Bible describes Jehovah as the source of all life and creator of all things.
Revelation 4:11
"You are worthy, our Lord and God, to receive glory and honor and power, for you created all things, and by your will they were created and have their being."
As a being having no beginning nor end
Psalm 90:2
Before the mountains were brought forth, or ever thou hadst formed the earth and the world, even from everlasting to everlasting, thou art God.
Attributes of God 7 (Eternal)
Has limitless power at his disposal:
Revelation 1:8
I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty.
Mark 10:27
And Jesus looking upon them saith, With men it is impossible, but not with God: for with God all things are possible.
His most outstanding personality characteristic is love:
1 John 4:8
He that loveth not knoweth not God; for God is love.
Attributes of God 6 (Love)
As being holy:
Psalm 145:17
The Lord is righteous in all his ways, and holy in all his works.
I John 1:5
This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.
Attributes of God 8 (Holy)