The Active Sync Tool is an add-on to the tools delivered by Microsoft Skydrive Pro. SkyDrive Pro is your company library which has been integrated as part of your SharePoint 2013 installation. (Please note that SkyDrive Pro differs from SkyDrive.) You can use SkyDrive Pro to organize and store company documents. All files stored in SkyDrive Pro are private by default, except files stored in a designated shared folder "Released for Everyone". You can easily share files and work on documents with colleagues. SkyDrive Pro data can then be synchronized on your computer.
Active Sync enables documents outsourced through the Active Repository Manager of the SharePoint or those which are indicated by a stub correspondingly to synchronize, so that when accessed the documents are synchronized and are available offline. Documents therefore which were outsourced through the Active Repository Manager of the SharePoint or those which are indicated by a stub can be also similarly synchronized by the Active Sync just as documents which are stored and are available offline.
Active Sync provides an add-on that lets you synchronize documents that have been filed from Share Point by using Active Repository Manger or those that are represented by a stub. The synchronization takes place in such a way that the outsourced or archived documents are loaded and at the same time synchronized and are also available offline.