An email list is a collection of email addresses used by individuals or organizations to send messages to multiple recipients at once. These lists are often used for marketing purposes, allowing businesses to share updates, promotions, or newsletters with subscribers who have opted in to receive communications. People can join email lists by providing their email addresses, usually through a website or sign-up form. This process helps ensure that recipients are interested in the content being shared. Managing an email list effectively can enhance engagement and build a loyal audience over time.