What the difference between rebuild index and re-organize index?

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avg_fragmentation_in_percent value

Corrective statement

&gt; 5% and &lt; = 30%

ALTER INDEX REORGANIZE

&gt; 30%

ALTER INDEX REBUILD WITH (ONLINE = ON)*

* Rebuilding an index can be executed online or offline. Reorganizing an index is always executed online. To achieve availability similar to the reorganize option, you should rebuild indexes online.