give best example for Rowspan and colspan

Answer 1

rowspan and colspan can be used to make one cell equivalent to two cells in size

http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_td_rowspan

http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_td_colspan

Answer 2

the best example for colspan is plus(+) button on a calculator