Here 320 million passwords gathered from dozens of world’s biggest data breaches been available. You can visit the site and check whether yours is or not.
If it is so then definitely change your password applying with more security options and if not pwned then lucky enough.
The word pwned is internet slang for owned which means to take advantage of someone. A hacker who has pwned you has stolen your data (mostly date of birth, interests, hobbies some times secrets also)
The site is easy to use : Simply type an old password , (not the current one) then press enter. If you are not pwned that doesn’t mean that you are safe enough,your safety depends on your alertness. It may be the chance that you are not indexed by the site.
You can also download passwords from the database from the site approx. 5.5 gb file. Hunt wrote in his blog that the site can be proved useful to every techsavvy as well as tech user or all sorts.
Ideally password should be at least of 15 characters with all sort of figures,alphabets,(caps and small) symbols/characters etc. so that safety is maintained as priority.