1. a number of different items
a selection/array of food/sweets/chocolates
A 'selection' or 'array' of items is an expression that has a positive connotation with choices of objects or the amount of variety on offer. If somewhere has a good selection, it means you have a lot of choices when it comes to making a decision: "I recommend this car dealer. They always have a vast selection of second-hand cars to choose from." You might hear this used in reviews of businesses or restaurants to talk about the 'array of food or products on offer.' In advertising, it can be used to boast about the number of items for sale.