Is the fastboot of an Android phone stored in an SD card or in a separate read-only memory (ROM) like BIOS?

is the fastboot of an Android phone stored in an SD card or in a separate read-only memory (ROM) like a computer BIOS?
what is the relationship between fastboot in mobile phone and fastboot in android SDK?

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Apr.19,2022
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-64f5-1bf42bd-31ece.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf42bd-31ece.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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