Overview

SQL Server Replication is Microsoft's set of technologies for copying and distributing data and database objects from one database to another, including options for synchronization, and is provided with SQL Server.  Replication can be used to distribute data to different locations and to remote or mobile users over LANs, WANs, dial-up connections, wireless connections, and the Internet.  Types of Replication include Snapshot Replication, Transactional Replication, and Merge Replication.

Resources

TechNet Wiki Articles

MSDN Library - SQL Server Books Online - Replication

SQL Server Replication
Product Evaluation (Replication)
Getting Started (Replication)
Planning and Architecture (Replication)
Development (Replication)
Deployment (Replication)
Operations (Replication)
Security and Protection (Replication)
Troubleshooting (Replication)
Technical Reference (Replication)
Administrator InfoCenter (Replication)
Developer InfoCenter (Replication)
Architect InfoCenter (Replication)