Window shopping, sometimes called browsing, refers to an activity in which a consumer browses through or examines a store's merchandise as a form of leisure or external search behaviour without a current intent to buy. Depending on the individual, window shopping can be a pastime or be used to obtain information about a product's development, brand differences, or sale prices. The development of window shopping, as a form of recreation, is strongly associated with the rise of the middle classes in 17th and 18th century Europe. Glazing was a central feature of the grand shopping arcades that spread across Europe from the late 18th century. Promenading in these arcades became a popular 19th-century pastime for the emerging middle classes. Traditionally, window shopping involves visiting a brick-and-mortar store to examine the goods on display, but it is also done online in recent times due to the availability of the internet and e-commerce. A person who enjoys window shopping is known as a window shopper. The development of window shopping, as a form of recreation, is strongly associated with the rise of the middle classes in 17th- and 18th-century Europe. As standards of living improved in the 17th century, consumers from a broad range of social backgrounds began to purchase goods that were in excess of basic necessities. An emergent middle class or bourgeoisie stimulated demand for luxury goods, and the act of shopping came to be seen as a pleasurable pastime or form of entertainment. Shopping for pleasure became a particularly important activity for middle and upper-class women, since it allowed them to enter the public sphere without the need for a chaperone. Prior to the 17th century, glazed shop windows were virtually unknown. Instead, early shopkeepers typically had a front door with two wider openings on either side, each covered with shutters. The shutters were designed to open so that the top portion formed a canopy while the bottom was fitted with legs so that it could serve as a shopboard.