Heat and work both are Point functions.

Point functions:

• Point functions are defined as the thermodynamic variable which depends on end states only i.e. initial and final states. They do not depend upon the path followed.
• The differential of point functions is exact.
• Pressure, temperature, volume, entropy, enthalpy, etc are point functions.

Path functions:

• Path functions are defined as the thermodynamical variables which depend on the way/path in which the thermodynamical system achieved the initial and final states.
• The differential of path functions is inexact.
• Heat, Energy transfer, work, and entropy generation are path functions.

Relationship between heat and work:

• Both are recognized at the boundaries of a system as they cross the boundaries; That is, both heat and work are boundary phenomena
• Systems possess energy, but not heat or work
• Both are associated with a process, not a state; Unlike properties, heat or work has no meaning at a state