Difference between last_modified_time and last_ddl_time in Hive?

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In Hive when we use the following command : SHOW CREATE TABLE TABLE_NAME ; It returns a list of metadata related to the particular table . Out of those metadata, there are two fields i am confused between.

'last_modified_time'='1620814731', 'transient_lastDdlTime'='1620820769'

What is the underlying difference between these two metrics ?

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