Polylang, a plugin-based solution that enables the management of multiple locales and language translations within a WordPress website. It sets the 'pll_language' cookie when the user selects a language from the dropdown menu to remember their choice for future visits. The cookie is used by Polylang to identify the user’s selected language on subsequent page loads, ensuring that content is displayed in the preferred language. This cookie is set as a first-party cookie and does not transmit any personal data.