Jehovah is one of the self-declared, choicest name of God (Ex. 6:3). It means: The Almighty; Most Sovereign; Creator; Possessor of all; The Man of war; etc. Manifest is defined as evident; obvious; plain; or apparent. While presence is defined as to be in attendance or show appearance.
Throughout ages, Jehovah has always demonstrate His obvious appearance whenever it is very necessary for Him to do so. Like when He came down to disperse the people at the Tower of Babel (Gen. 11:1-8), as well as to put an end to the maltreatment of the Israelites by the Egyptians (Ex. 3:7-8).
In Gen. 28:10-22, Jacob ran away from Canaan to Haran (Turkey) because of his brother Esau. He travelled through the desert in terrible condition: on foot, no change of cloth, harsh climate and bad terrain. One night, as he approached a city called Luz, the sun set and he had to sleep out of town on sand with a stone as a pillow.
That night, he had a dream, he saw a ladder from heaven touching the earth. Angels were ascending and descending the ladder, and God was speaking from the topmost of the ladder. When he woke up, he exclaimed “God was in this place and I knew it not!” He then worshipped God and made a vow unto God.
Though Jacob was in a hostile terrain, alienated from loved ones, destitute and unsure of his destiny. God encouraged him with His manifest presence and the transfer of Abrahamic covenant upon his life.