no difference
Kaaba is a circumambulating of pilgrims. Tawaf is also a performance by the pilgrims.
You circle around the Kaaba as a worship to Allah for example in omrah or haj
The kaaba is holy because it is concidered to be the house of God or Allah.
The Qibla (which the direction of the Muslims during praying) is to face Kaaba when the Muslim is praying.
in mecca
makaah
Many religious things happened at the Kaaba, including religious ceremonies.
black
retaj
holiest shrine in Arabia :)))
Some people go to the Kaaba to touch the Black stone. Or they go to preform sacred rituals for thier religion.