This is the repository that explains different Design Pattern and some Problems Related to them. The first task explains the Constituency Pattern where we have to find whether we can arrest People or Not.The Second task was to design a Low LeveL Program that deals with inverter and their class. The Day 2 Task was to design a Parking Lot System that have numerous floors. The Day 3 Task was to make an ATM that include 2 Functions. One is to Top-Up the ATM and the second one is to Withdraw the Money. The Day 4 task is to make a Library Management System that Books and Book Item where Member can Issue and Renew a Book and same goes with Librarian. The Day 5 Task was to Impliment a Chat App that helps you to send a Text Message and helps you to do a Video Call.