presta

Presta is a term with two common references in cycling and computing. It can denote a type of bicycle tire valve, or an open‑source e‑commerce platform called PrestaShop.

The Presta valve, also known as the Sclaverand valve, is a slender valve used on many road and high‑pressure bicycle inner tubes. It has a threaded stem with a small locknut at the top that must be loosened to open for inflation. The valve is typically lighter and can withstand higher pressures than the Schrader valve. To inflate, a pump head compatible with Presta valves or an adapter is required. After inflating, the nut is tightened to seal. A cap protects the valve from dirt and helps maintain the seal. Presta valves may require a pump head that specifically accommodates the valve or the use of an adapter when using standard pumps.

In computing, Presta usually refers to PrestaShop, a free, open‑source e‑commerce platform for building online stores. PrestaShop is written in PHP and uses MySQL or MariaDB for data storage, with Smarty as its templating engine. It supports multiple languages and currencies, a modular architecture, and a marketplace of themes and modules for payments, shipping, and marketing. It is typically self‑hosted and maintained by a global community of developers and merchants.