Trailing slash

Trailing slash.What it is? What it's important?These question is moving in my mind from few days.I searched many sites to read their opinion and why and how it affects your seo.After all I came to know about Google post from their Google central blog that its not so important that people are giving,but you should have one option for all which you prefer.Means you can prefer your link with slash or without slash.

What do thing about it?I am gonna to write a post about it in my main blog,surely I will update the link here after posting. Thanks.