SAP NetWeaver AS ABAP Release 740, ©Copyright 2014 SAP AG. All rights reserved.
ABAP Keyword Documentation → ABAP Glossary →Visibility Section
The declaration section of a class can be subdivided into up to four visibility sections. These areas are public, protected, or private. They define the visibility of the components of the class and, in doing so, the interfaces of the class for those users permitted by the package check concept.