Advertising opt-out refers to the process of choosing to not receive targeted advertisements from a particular company or platform. This can be done by either unsubscribing from email lists, adjusting privacy settings, or using browser tools to block ads. By opting out, individuals can control the amount and type of advertisements they are exposed to, reducing unwanted marketing and preserving their online privacy. It is an important tool for consumers to exercise their right to choose what information they are willing to share with advertisers.