What's the difference between block level elements and inline elements

Answer 1

A complete line of blocks, but the inline is not the owner , for understand this mean try (two div next to each other) and (two span next to each other) .

Answer 2

block level elements such as P or Div create a new line in the makeup and take up the width of the container, inline such as span or strong etc go in flow with the line of text.