Breadcrumb is the way by which we provide the links on the top of the post so that user know from where he started and where is right now. So we can say this is the way to see the user navigational way in the website. In other word breadcrumbs can be a great way to help users identify where they are located.
You can use it in body part of the web page and you can call it for all the web pages with the help of include function.
This is a section of a webpage which helps users understand their location within the whole website. It is coded by the webmaster and usually appears close to the top of the page.
An example can be seen on this page where the breadcrumbs are:
Home > SEO > What are Breadcrumbs?
This states that the route to this page (from the home page) is via the SEO Glossary page.
Breadcrumbs are extremely helpful to internet users in very large websites and especially in shopping sites where they can confirm they are browsing in the right area. For example:
Home > apparel > women apparel > LCD
In the same way breadcrumbs help search engines structure your website correctly in their index. Recently Google added breadcrumbs in their search results and they can be seen in green text below the description if the website uses them.
Google is integrating breadcrumbs navigation within the SERPs which actually makes your listing look more attractive and trustworthy (well, you may want to argue this but that’s a matter of taste, I like it):
Not in every case the breadcrumb navigation is picked up. The algorithm behind this is certainly a mystery but putting the breadcrumb trail closer to the top of the page source code should help (note: I am not claiming this is the only factor that comes into play but from a few cases I’ve seen, the closeness to the top does seem to make Google recognize the breadcrumbs easier).