2
It's just a form that takes a GET parameter named s.
Example:
<form method="get" action="/">
<input type="text" name="s" placeholder="type here to search">
</form>
But I recommend using the function called get_search_form() that does basically the same thing.
2
it adds additional value before and after each Like query
That {d146fc7cb41ff444163abadd50ac5da7ec5439fd51386c3cfe2cea107126703b} is a placeholder escape string for the literal % (percent) sign used in prepared statements (see wpdb::prepare()) and the escape string is generated by wpdb::placeholder_escape().
So actually, that {...
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