could someone please simplify the difference between inline and block elements

Answer 1

A block level element starts on a new line and takes up the full width available.

An inline element doesn't start on a new line and only takes up as much width as necessary.

Answer 2

Inline tag allows to format the text, to apply italics/underlining.., they are inside. And block tags there begin the new element or new part of the document, whether it can be the paragraph, a form, the image, etc.

Answer 3

@Tamara, img is an inline element.