What's the ItemPointer's meaning here?

From: jacktby jacktby <jacktby(at)gmail(dot)com>
To: pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: What's the ItemPointer's meaning here?
Date: 2023-09-26 14:16:15
Message-ID: 62132F1A-82B1-4A9C-BAEA-42651D9D4BBF@gmail.com
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/* Typedef for callback function for table_index_build_scan */
typedef void (*IndexBuildCallback) (Relation index,
ItemPointer tid,
Datum *values,
bool *isnull,
bool tupleIsAlive,
void *state);
When we build an index on an existed heap table, so pg will read the tuple one by one and give the tuple’s hepatid as this ItemPointer, is that right?

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