Self checkout machines provide a mechanism for customers to pay for purchases from a retail

Retail

Retail consists of the sale of physical goods or merchandise from a fixed location, such as a department store, boutique or kiosk, or by mail, in small or individual lots for direct consumption by the purchaser. Retailing may include subordinated services, such as delivery. Purchasers may be...

er without direct input to the process by the retailer's staff. They are an alternative to the traditional cashier

Cashier

Cashier is an occupation focused on the handling of cash money.- Retail :In a shop, a cashier is a person who scans the goods through a machine called a cash register that the consumer wishes to purchase at the retail store. After all of the goods have been scanned, the cashier then collects...

-staffed checkout

Point of sale

Point of sale or checkout is the location where a transaction occurs...

. They have been implemented most often in grocery stores and other large-scale stores.
In self-checkout systems, the customer

Customer

A customer is usually used to refer to a current or potential buyer or user of the products of an individual or organization, called the supplier, seller, or vendor. This is typically through purchasing or renting goods or services...

 is permitted to scan the barcode

Barcode

A barcode is an optical machine-readable representation of data, which shows data about the object to which it attaches. Originally barcodes represented data by varying the widths and spacings of parallel lines, and may be referred to as linear or 1 dimensional . Later they evolved into rectangles,...

s on their own items, and manually identify items such as fruit

Fruit

In broad terms, a fruit is a structure of a plant that contains its seeds.The term has different meanings dependent on context. In non-technical usage, such as food preparation, fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state,...

s and vegetable

Vegetable

The noun vegetable usually means an edible plant or part of a plant other than a sweet fruit or seed. This typically means the leaf, stem, or root of a plant....

s (usually with a touchscreen

Touchscreen

A touchscreen is an electronic visual display that can detect the presence and location of a touch within the display area. The term generally refers to touching the display of the device with a finger or hand. Touchscreens can also sense other passive objects, such as a stylus...

 display), which are then weighed where applicable, and place the items into a bagging area.