What is difference between <b> & <strong> or <i> & <em> ?

Question

I want to know if both tags created for same work then why we're using both of them.... And if any difference between them then please tell me

Answer 1

These may help you...
https://www.sololearn.com/discuss/907042/?ref=app
https://www.sololearn.com/discuss/248738/?ref=app
https://www.sololearn.com/discuss/1755074/?ref=app
https://www.sololearn.com/discuss/237558/?ref=app
https://www.sololearn.com/discuss/118674/?ref=app
https://www.sololearn.com/discuss/427264/?ref=app
https://www.sololearn.com/discuss/124411/?ref=app
https://www.sololearn.com/discuss/177599/?ref=app
https://www.sololearn.com/discuss/288906/?ref=app