Yahoo! Pipes was a web application from Yahoo! that provided a graphical user interface for building data mashups that aggregate web feeds, web pages, and other services; creating Web-based apps from various sources; and publishing those apps. The application worked by enabling users to “pipe” information from different sources and then set up rules for how that content should be modified (for example, filtering). In addition to the pipe editing page, the website had a documentation page and a discussion page. The documentation page contained information about pipes including guides for the pipe editor and troubleshooting. The discussion page enabled users to discuss the pipes with other users.
Yahoo! Pipes was released to the public in beta on 7 February 2007. It was built by Pasha Sadri, Ed Ho, Jonathan Trevor, Ido Green, and Daniel Raffel of Yahoo! It is described by its creators as:
…a hosted service that lets you remix feeds and create new data mashups in a visual programming environment. The name of the service pays tribute to Unix pipes, which make it easy to chain simple utilities together on the command line.— Official Yahoo! Pipes Blog, 
On 4 June 2015, it was announced that Pipes would be in read-only mode from 30 August 2015, and shut down on 30 September 2015. Yahoo does not offer a paid version, but instead has shut down the program entirely.
The purpose of Yahoo! Pipes was to create new pages by aggregating RSS feeds from different sources. Yahoo! Pipes had many modules which could be used either to grab data from sources or to edit the data that was grabbed from the sources. These modules were grouped into categories: sources, user inputs, operators, URL, string, date, location, and number.
To create or edit a pipe, the user had to sign up with a Yahoo! ID. Creation and editing of the pipes was completely online; the user didn’t have to download a plug-in, program or app. The user selected the “Create a pipe” option to open the Pipe Editor. The pipe editor was composed of three panes: the canvas, the library, and the debugger. The pipe was created using these panes. After creation, the pipe was saved and run. The user was then able to give a name and short description to the pipe. If the creator of the pipe decided to publish the pipe, it would become visible for everyone. Other users had the ability to clone the pipe, which they could then edit for their own use.
The canvas was the main pane where the editing of pipes was done. It was in the center of the page. Modules that were selected from the Library pane were dragged on this pane and connected together. After the modules were wired in the desired order, the pipe was ready to be used.
The Library was the place where the modules are selected to be dragged on the Canvas. These modules were grouped by their functions. The library pane was on the left hand side.
In this category, there were modules which were used to grab data from one or multiple sources on internet.