jquery - Why do we write .attr('selected','selected') with select tag -

why write .attr('selected','selected') select tag

for ex:

$('#countrylist option').filter(function () {  return ($(this).text() == findtext); }).attr('selected','selected'); }); 

what means?

explanation of .attr('selected','selected').

first argument inside .attr represent attribute want pointing @ while second argument set value of attribute passed first argument.

if have .attr('selected') return value of selected attribute.