How to make a program which gives an explanation (definition) of any word when we move the mouse onto?

Question

as we can see in sololear presentations they have every keyword underlined and when we move mouse onto that word is shows us a definition. Can yiu help me in understanding how it works? should I use JS and mouse functions?

Answer 1

well, in html 5 . you can use the title attribute on a specific word to show a text when you hover the mouse over it, also make the word underlined.. So I think all you need is html & css

Answer 2

thanks friend!