Site 
A specific, discrete area for production where you want to gather and track information
In the system, a site can be one of the following:
An entire plant where you manufacture product
A separate, smaller facility at a plant where you manufacture product
A specialized portion of a plant or facility, such as an area where you process return material authorization (RMA) or rework printed circuit assembly (PCA) boards
The entire installation has a master site called the global site. The name of the global site is indicated by an asterisk (*).
Some default values, such as system rules, can be set at the global site level, and then at the site level.
Within the system, each site operates independently and maintains its own elements, such as materials, bills of material, and routings.
Certain configurations, such as Activity Maintenance and Activity Group Maintenance, apply to all sites within one database.
If you need to add new codes and system rules that may have been provided in a new release to an existing site, you choose Reload Initial Data in Site Maintenance (see Reloading Initial Data (IDAT)).
Sites have the following attributes:
Type
Time Zone
Server and Port
Login and Password
For more information, see Site Maintenance.
You can change system rule settings for a specific site overriding the global settings in System Rule Maintenance (see System Rule Maintenance).
When you use Site-to-Site Transfer between sites that are not in the same database, you create a site record in the source database to tell the system about the destination site (see and Site-to-Site Transfers).
SAP ME site corresponds to SAP ERP plant. For more information, see SAP ME ERP Integration (SAPMEINT).