How can i create "bind variable"

How can i create "bind variable" in my DB to support any procedure in my DB.
Thank you very much.

In SQL*PLUS we can defined bind variable
SQL>var x varchar2(250); -- Is x bind variable or i'm misunderstand ?
and ... in my procedure i can used ' &x ' to pass valued of 'x' from sql prompt to my procedure.
but i'm not sure variable x is still remain in DB because i need to pass variable
" v_stmt := 'and employee_id between ..... ' " from FORM to PROCEDURE in DB
how can i do

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