What is the diference beeween the <b> and the <strong> element and the <i> and the <em> elements?

Question

Why is there a strong and the b element if they both make the text bold?
Same with the <i> and the <em> elements.
https://code.sololearn.com/WQCLohuWtLmF/?ref=app
https://code.sololearn.com/We38uQy7Zs7x/?ref=app

Answer 1

i am. on my android in case

Answer 2

@Charan leo25
what are you talking about
i need the answer not the websites
i am not allowed to go to other websites