!!! Overview
[{$pagename}] is a [Flexible Single Master Operation] and a [Domain Controller] responsible for performing updates to the [Microsoft Active Directory] [Schema Partition]\\
(that is, the schema naming context or LDAP://cn=schema,cn=configuration,dc=<domain>). [{$pagename}] is the only [Domain Controller] that can process updates to the [Microsoft Active Directory] schema. Once the Schema update is complete, [{$pagename}] the replicates to all other [Domain Controllers] in the directory. There is only one [{$pagename}] per [AD Forest].

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [Active Directory FSMO roles in Windows|https://support.microsoft.com/en-us/help/197132/active-directory-fsmo-roles-in-windows|target='_blank'] - based on information obtained 2018-07-10- 
* [#2] - [6.1.5.1 Schema Master FSMO Role|https://msdn.microsoft.com/en-us/library/ff634482.aspx|target='_blank'] - based on information obtained 2018-09-27-