Use of a solenoid for inductance

[Mr Davis 97]

Although I'm sure the answer is obvious, but why are solenoids used as inductors? Why don't entire circuits in general have inductor properties, since the entire circuit creates magnetic fields? More specifically, why don't random points along a circuit do the same thing as a solenoid (retain a magnetic field) since they create fields too? Is it because the solenoid is more powerful thus it affects on current and voltage are more noticeable?

 

[rootone]

Local currents in a circuit WILL induce a small amount of local magnetic field ,which usually are of no importance for the circuit.
A solenoid is a component which is designed with the specific intention of maximizing a magnetic field, often for the purpose of producing a mechanical kinetic result, such as turning a switch on or off..