Multi Site Manager (MSM) enables you to use the same site content in multiple locations. MSM uses its Live Copy functionality to achieve this:
1. With MSM you can:
a. Create content once and then
b. Copy this content to, and re-use this content in, other areas ( live copies ) of the same or other sites.
2. MSM then maintains the (live) relationships between your source content and its live copies so that:
a. When you make changes to the source content, the source and live copies are synchronized (to apply these changes to the live copies too).
b. You can make adjustments to the content of the live copies by disconnecting the live relationship for individual sub pages and/or components. By doing this, changes to the source will no longer be applied to the live copy.
Note: MSM does not translate the content. It is used to create the required structure and deploy the content.
See Translating Content for Multilingual Sites if you want to extend such an example.