Spam filters are tools used by email services to identify and block unwanted or harmful messages, often referred to as spam. These filters analyze incoming emails based on various criteria, such as keywords, sender reputation, and user behavior. By doing so, they help keep your inbox clean and safe from potential threats. When a spam filter detects a suspicious email, it may move it to a separate folder, often called junk or spam folder, where users can review it later. This process helps prevent phishing attacks and reduces clutter, allowing users to focus on important messages.