[Tasks] Synchronizing data occurs when the Snapshot Agent, Distribution Agent, or Merge Agent runs and updates are propagated between Publisher and Subscribers. For snapshot replication, the snapshot will be reapplied at the Subscriber. For transactional replication, the Log Reader Agent will store updates in the distribution database and updates will be propagated to Subscribers by the Distribution Agent. If using updatable subscriptions with either snapshot replication or transactional replication, data will be propagated from the Subscriber to the Publisher and to other Subscribers. For merge replication, data is synchronized during the merge process when data changes at all servers are converged and conflicts, if any, are detected and resolved. [Stage] 
Synchronizing Data