Hash tables are not specific to C#. A hash table is a dynamic set data structure. It has three basic functions: to store data (SET/INSERT); to retrieve data (SEARCH/RETRIEVE), and to remove data that has previously been stored in the set (DELETE). In this way it is not different from other dynamic set data structure such as linked lists or trees. What is interesting about hash tables is their performance characteristics with respect to the store/retrieve/remove operations.
Understanding Dropshipping. Dropshipping is a retail fulfillment method where a store doesn't keep the products it sells in stock. Instead, when a store sells a product, it purchases the item from a third party and has it shipped directly to the customer. As a result, the merchant never sees or handles the product.
Answer Wiki. Dropshipping is a method in which you as the seller do not keep the products in your inventory, instead you work with a supplier who sends the products directly to your buyers. Your profit comes from the price difference between the payment you receive from the buyer and the amount you paid to your supplier. An example: