Inline eleement : inline element are those which only occupy space bounded by tags . inline element only take up as much width as necessary .Inline element does not start with new line . span tag is example of inline ement .You can put several span tag in one line and they will display in a line.
block element :=> block level element take whole width of that line .each block level lement will start from new line.
<p> and <div> element is an example of block level element