What is the difference between a web page opened by selenium and a web page opened manually? What is the difference in the use of resources?

I use selenium to open a website on ie, but the site is not closed, and then I use selenium to open another website. As a result, the site cannot be logged in.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b30565-2bd1c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b30565-2bd1c.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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