what is difference between strong and bold

Answer 1

The bold format will remain the same on every browser, while the strong will change depending on how the browser is instructed to interpret the strong format ( these days you will not notice any difference since all browser make the strong format appear bold, but some programs that read the text of a web page for blind people, will emphasize the word with a strong format, letting know the people listening that those words are important, while with the bold format it will read it as normal text)

Answer 2

They may look the same to humans, but the web crawlers or bots – that crucial second audience – see something quite different. When a search engine spiders and analyzes a page, text in <strong> tags is considered important. Text in <b> tags is not.