When sending emails to multiple recipients, it's often necessary to keep some of the recipients' email addresses private, which is where adding bcc in outlook comes in. This feature allows users to send emails to a large group of people without revealing everyone's email address, which can be useful for maintaining email privacy and security. By using the bcc feature, users can avoid cluttering the "to" field with numerous email addresses and prevent unwanted replies or forwards. One of the key benefits of increased discretion when sending emails is that it helps to prevent spam and reduces the risk of email addresses being shared without consent.