Redirection is one kind of function which forward, which take any link(url) to another link(url).It is important in SEO. Among the 301 Redirection is the best choice.
Why You should use Redirection ?
If you update your content and post similar but with new view with new link then you should use redirection.Cause Search Engines had Crawled your old post , if they not find the link or either user can’t go to that destination it will effect your blogs rank.
If you have changed your permalink to make seo friendly url then you may to redirect it .
You can also change your affiliate link and can make it shorter via Redirection.
Redirection means which link(1) will take you to another place(link) from original link(1) .There are three kind of Redirection .They are :
301 Redirect ( Highly Recommended)
301 Redirect ( Highly Recommended) : It is that kind of redirection which will take your original link to targeted link directly.It means the page(link) is moved Permanently.
302 Redirect : 302 Redirect is Temporarily moved link. Its quality is so poor that it is not best technique for SEO.
Meta Refresh : Meta Refresh is a function which will take some time for Redirection.It slows your redirection plan.
Some useful Plugins of WordPress for Redirection.You may use it to manage your blogs redirection.
Redirection is a WordPress plugin to manage 301 redirection , keep track of 404 errors, and generally tidy up any loose ends your site may have. This is particularly useful if you are migrating pages from an old website, or are changing the directory of your WordPress installation.
Go for Redirection : https://wordpress.org/plugins/redirection/
SEO Redirection Plugin
By SEO Redirection Plugin you can build redirections easily for your site, you can set up all types of redirectoin including 301,302 or 307 redirect, you can also monitor 404 error pages and redirect them in one mouse click, we concentrated on simplicity in this plugin to meet all user levels.
Go for SEO Redirection Plugin : https://wordpress.org/plugins/seo-redirection/
WordPress SEO by Yoast
You can also use WordPress SEO by Yoast to manage Redirections.When you write a post you will find a snippet editor and a great tool for posts SEO – box Named WordPress SEO by Yoast ( if installed).Then click Advanced and you can make their 301 Redirection.
Go for SEO WordPress SEO by Yoast – http://wordpress.org/plugins/wordpress-seo/