PC Optimum is a loyalty program offered by Loblaws and its affiliated stores, allowing customers to earn points on their purchases. Members can accumulate points by shopping at participating locations, including Shoppers Drug Mart and No Frills, and by using the PC Financial services. Points can be redeemed for discounts on future purchases, making it a popular choice for shoppers looking to save money. The program also offers personalized offers and promotions based on shopping habits, enhancing the overall shopping experience for members.