Fins

What is the difference between fin efficiency and fin effectiveness? (No need to write the equations.)

Hint
How does heat transfer apply in a theoretical and an actual sense?
Hint 2
How is heat transfer performance impacted by a fin?
Fin efficiency:
$$$\eta _{f}=\frac{heat\:transfer\:rate\:of\:a\:real\:fin}{heat\:transfer\:rate\:of\:an\:ideal\:fin}$$$
Ideal fin: entire fin surface area at the base temperature.
Real fin: finite conduction resistance, temperature gradient exists.

Fin effectiveness:
$$$\varepsilon _{f}=\frac{heat\:transfer\:rate\:with\:fin}{heat\:transfer\:rate\:without\:fin}$$$
Fin efficiency:
$$$\eta _{f}=\frac{heat\:transfer\:rate\:of\:a\:real\:fin}{heat\:transfer\:rate\:of\:an\:ideal\:fin}$$$
Fin effectiveness:
$$$\varepsilon _{f}=\frac{heat\:transfer\:rate\:with\:fin}{heat\:transfer\:rate\:without\:fin}$$$