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+ACID transactions guarantee atomicity, consistency, isolation, and durability so
+that database operations are executed safely, even when failures occur. ACID
+transactions are required in some industries where errors or partial updates
+could lead to serious financial, legal, or safety consequences. 
+
+By default, operations on single documents conform to ACID standards. For
+operations on multiple documents or collections, MongoDB supports multi-document
+ACID transactions by using sessions. Sessions operate on data from a single
+point-in-time snapshot, so applications see a consistent set of data while the
+transaction is running. Sessions rely on write concerns to ensure changes to data are
+submitted safely. 
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