what is the difference between resistor and resistance?

Resistance:

• The property of a conductor due to which it opposes the flow of current through it is called resistance.
• Resistance( R)=Potential difference(V)/Current(I)
• The resistance of a conductor depends on length,thickness,nature of material and temperature of the conductor.
• The SI unit of resistance is 'ohm '.

Resistivity:

• It is the resistance of a unit length with unit area of cross section of the material of the conductor.
• Resistivity
• The resistivity depends upon the nature of material and average relaxation time of the free electrons in the conductor.
• The SI unit of resistivity is ohm-m.

Resistance is a property of a material (any material wood, plastic, steel etc.) which measures its ability to resist (or prevent) the flow of current through it.

Resistor is the material or an electrical component whose property of resistance is under consideration.

Thus, a resistor has a certain resistance and can be used in a circuit

Resistance is the property of a conductor, which determines the quantity of current that passes through it when a potential difference is applied across it.

A resistor is a electrical componet with a predetermined electrical resistance, like 1 ohm, 10 ohms 100 ohms 10000 ohms etc..

depending on how much current you want to pass through a circuit, you would design the circuit with the required resistors