A mailing list is a database of email addresses that businesses can use to send marketing communications. People can volunteer to receive these emails by giving their contact information to the business, usually in exchange for receiving free content, discounts, or other offers. Businesses typically collect email addresses using signup forms on their website. Incentives like these can encourage customers to sign up for the mailing list, allowing businesses to build a database of potential leads. Email marketing can be an effective way to reach out to customers and promote products or services. However, it is important to manage the mailing list responsibly and avoid sending too many emails, as this can lead to unsubscribes and damage the reputation of the business. Used effectively, a mailing list can be a valuable tool for promoting a business.