How to define blocks in HTML

Question

How to define blocks?!

Answer 1

A block-level element is an HTML element that begins a new line on a Web page and extends the full width of the available horizontal space of its parent element.
In contrast to a block-level element, an inline element can begin within a line, does not start a new line,Its width only extends as far as it is defined by its tags. 
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Answer 2

thanks :)