Retention is important for e-commerce mobile apps because it reflects the ability of the app to keep users engaged and coming back over time. A high retention rate indicates that users are finding value in the app and are likely to continue using it.
A low retention rate may indicate that users are not finding the app useful or are experiencing problems that are causing them to abandon it.
If the app is able to keep users engaged and coming back over time, it is more likely to generate repeat purchases and increase overall revenue.