Breadcrumbs or breadcrumb trail are a navigation technique used in user interfaces. Nautilus is the official File manager for the GNOME desktop The name is a play on words evoking the shell of a Nautilus to represent an The user interface (or Human Computer Interface) is the aggregate of means by which people&mdash the users '&mdash interact with the System Its purpose is to give users a way to keep track of their location within programs or documents. The term is taken from the trail of breadcrumbs left by Hansel and Gretel in the popular fairytale. Breadcrumbs or bread crumbs (regional variants breading crispies are small particles of dry Bread, which are used for Breading or crumbing foods topping Hansel and Gretel ( Hänsel und Gretel) is a Fairy tale of Germanic origin adapted by the Brothers Grimm and earlier by Giambattista
Breadcrumbs typically appear horizontally across the top of a webpage, usually below any title bars or headers. They provide links back to each previous page that the user navigated through in order to get to the current page, for hierarchical structures usually the parent pages of the current one. Breadcrumbs provide a trail for the user to follow back to the starting/entry point of a website. They may look something like this:
Home page → Section page → Subsection page
There are three types of web breadcrumbs:
Path breadcrumbs are dynamic and show the path that the user has taken to arrive at a page.
Location breadcrumbs are static and show where the page is located in the website hierarchy.
Attribute breadcrumbs give information that categorizes the current page.
Some commentators criticize Path-style breadcrumbs because they duplicate functionality that properly subsists in the browser; namely, the 'Back' button and browsing history.
Location breadcrumbs are not necessarily appropriate for sites whose content is so rich that single categories do not fully describe a particular piece of content. This is a common situation in sites employing a search-base navigation paradigm (for example, Amazon). In general, wherever a strict hierarchy is not applicable, Location breadcrumbs are inappropriate.
Some commentators and programmers alternatively use the term "cookie crumb" (or some variant) as a synonym to describe the previously mentioned navigation technique, but this usage is considered incorrect and most likely represents a linguistic corruption of the original "breadcrumb" metaphor. Corruption or bastardisation is a way of referring to certain changes in a Language. This misuse is further problematic because "cookie crumb" is often used to describe a datum or parameter inside an HTTP cookie file; another technology used on the web that is nonetheless distinct from the navigational method. HTTP cookies, or more commonly referred to as Web cookies tracking cookies or just cookies are parcels of text sent by a server to a Web client (usually 
Advanced GPS tools may keep track of the motion of a GPS device bearer by recording the positions of the traveller at specified time moments and presenting them at a GPS display as a "breadcrumb trail" of position markers. Basic concept of GPS operation A GPS receiver calculates its position by carefully timing the signals sent by the constellation of GPS Satellites high above the Earth