Print Monopoly Property Cards What Does It Mean In The Monopoly Board Game: Mortgaged, Unmortgaged And Unimproved Property?

What does it mean in the Monopoly board game: mortgaged, unmortgaged and unimproved property? - print monopoly property cards

I have the rules of classic Monopoly game, and I'm confused, is the payment of rent

After landing on a property owned by another player the owner collects the rent in accordance with the list printed on the card in writing.
If the property is mortgaged, no rent can be raised. When a property is mortgaged, its Title of the Book is placed face down against the owner.
It is an advantage, written all the cards in a color group (such as Boardwalk and Park Place, or Connecticut, Vermont and Oriental Avenue), because the landlord can require twice the rental of properties in the hold group has improved the color . This rule applies to collateral pledged property, even if another property of that color group.