Do-Follow vs No-Follow !

DOFOLLOW-

1) It has special HTML markup inside that tells Search engine like google to follow the destination inside the link.

EXAMPLE--

-Normal link-HTML markup

<a href="http://www.google.com/">google website </a>

-Dofollow link-HTML markup

<a href="http://www.google.com/" rel="dofollow"> google website </a>

NOTE- basically it can't do anything jf we leave it without applying(rel="dofollow"), LINK BEHAVES SAME.

2) applying it will increase the page rank.

3)Good for Human traffic as well as SEO traffic.


Now,

NOFOLLOW-

1)It has special HTML markup inside that tells Search engine like google not to follow the destination inside the link i.e. Bot(spider) will not follow the link. means it will not crawl that link.

EXAMPLE--

<a href="http://www.google.com/" rel="nofollow"> google website </a>

2)Good for Human traffic.

3)Not contain SEO properties.