In technology, a mashup is a web application that combines data from more than one source into a single integrated tool; an example is the use of cartographic data from Google Maps to add location information to real-estate data, thereby creating a new and distinct web service that was not originally provided by either source.
Mashup originally referred to the practice in pop music (notably hip-hop) of producing a new song by mixing two or more existing pieces together.
Above words come from [1]
What is MetaSeeker toolkit
MetaSeeker toolkit provides a series of tools which semantically describe data schemas of target Web pages, construct Data Schema Specification Files and Data and Clue Extraction Instruction Files, continuously extract information in bulk from the Web, produce and store Data Extraction Result Files with semantic meta data. All above activities are necessary for collecting contents during building up information services.
