Way to insert text having ' (apostrophe) into a SQL table

1:If you insert data through procedure

eg. create proc tt @in varchar(20) as  select @in

exec tt "test's"  --here used "string inputparameter" instead of  'string inputparameter'

2:isert manulay into data base (DML)

eg.select 'test''s'  --add one more '   instead of ' (apostrophe)

Please share if any other solution...

Thanks & Regards

Subhash Chandra