Email bounces occur when an email cannot be delivered to the recipient's inbox. There are two types of bounces: soft bounces and hard bounces. Soft bounces are temporary issues, such as a full inbox or a server problem, while hard bounces are permanent issues, such as an invalid email address. To manage bounces, regularly clean your email list by removing hard bounce addresses and attempt to re-engage with soft bounce addresses. Monitoring bounce rates and taking corrective actions can help in maintaining a healthy email list and improving deliverability.