Seasoning isn’t just recommended for cast iron pans, it’s a requirement.
"Seasoning" is a nongreasy layer of oil that is bonded to the surface of the pan, which protects it from rust while also imparting nonstick properties.
A well-seasoned pan will appear deep black, and will be almost non-stick.
It can and will last a lifetime and get better with age.
Caring for Cast iron
Drying it immediately after washing (to prevent rust) and giving it a coat of oil after each soap and water rinse.
Keep your pan out of the dishwasher, and wash it with soap and waterby hand.