Email and messaging face constant spam and phishing. AI filters learn the patterns of unwanted and malicious messages and sort them out before they reach people, adapting as the tactics change, which keeps inboxes usable and blocks many scams.
Smarter filtering catches cleverly disguised attacks that simple rules miss and reduces the chance someone clicks a harmful link. Attackers adapt, sometimes using AI themselves, so it is an ongoing contest, and filters must avoid wrongly blocking real messages. Still, this largely invisible defence is one of the most widespread and useful everyday applications of AI.