Why do some messages go to junk folder?

Messages often end up in the junk folder due to spam filters that analyze various factors, including the sender's reputation, the email content, and user behavior. If an email contains certain keyWords, excessive links, or is sent from a suspicious domain, it may be flagged as potential spam. Additionally, if a recipient frequently marks similar messages as junk, the filter learns to redirect future messages from that sender to the junk folder. These measures aim to protect users from unwanted or harmful emails.