Used for running multiple database queries/statements. Such as, queries separated by a semi-colon ';' in SQL. Or running multiple queries via separate requests.
SQL Example:
SELECT * FROM table1;
SELECT * FROM table2;
PHP/mysqli example1:
mysqli_multi_query(
"SELECT * FROM table1;
SELECT * FROM table2;"
);
PHP/mysqli example2:
This isn't really good practice, compared to the previous example, but this tag would still be fitting for a question with this type of code.
mysqli_query("SELECT * FROM table1");
mysqli_query("SELECT * FROM table2");
However, for PHP/mysqli, you should use mysqli-multi-query
