Permalink is also called Permanent Link. This is the link of your post. Every post of your blog has its own unique permalink. The permalink is assigned according to the blog link, year and date.

Whenever you open a post of any blog, you can see the year and month within that link. The post link consists of blog home URL, post publishing year, month and ending with some words separated with hyphen (-). These words are fetched from the starting text of the post (from post title). The permalink takes normally a maximum of eight (8) words from the title and neglect the rest of. So the full form of a post title is in the following format:

Automatic Permalink is created by blogger automatically. Almost 98% bloggers use automatically assigned permalink. The automatically assigned permalink has very length because of automatically fetched maximum words from the post title. That's why an automatic permalink is meaningless because of a maximum limit of words. You can check your permalink setting from "Post settings under Permalink Tag.

You can assign your own permalink according to your  need to make it meaningful. Another benefit of custom assign permalink is that your post link become shorter than automatic permalink. To assign a custom permalink, select "Custom Permalink" option and write the words according to your post. Remember that spaces and special characters are not allowed in this portion. You have to put hyphen (-) to separate the words.