What is a kiss?

What is a kiss?

In view of

Geometry:

"kiss is the shortest distence between 2 lips!..

Economics:

"kiss is that thing 4 which DEMAND is always higher than SUPPLY!....

PHYSICS:

"kiss is the process of caharging a human body!..

Computer:

"like a LAN, in which 2 bodies r conected without any DATA CABLE!...