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When planning for Lync, the first major decision is how to deploy Microsoft Lync: as Lync Server 2013 on premises, or Lync Online with Microsoft Office 365 in the cloud.
Lync Server 2013 on-premises : This choice provides the complete Lync feature set and provides ultimate flexibility in configuring, customizing, and operating your deployment. All servers are installed onsite and maintained by your organization. An on-premises deployment provides the full range of Lync Server features.
Lync Online in the cloud Lync Online is designed for organizations that want the cost and agility benefits of cloud-based instant messaging, presence, and meetings without sacrificing the business-class capabilities of Lync Server. With Lync Online, Microsoft deploys and maintains the required server infrastructure, and handles ongoing maintenance, patches, and upgrades. Some features available in an on-premises deployment are not available in Lync Online.