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@ -1,41 +1,45 @@
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# YaCy
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<div align="center">
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<h1 align="center">YaCy</h1>
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Search Engine Software
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[](https://gitter.im/yacy/yacy_search_server?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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[](https://github.com/yacy/yacy_search_server/actions/workflows/ant-build-selfhosted.yaml)
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[](https://yacy.net/download_installation/)
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[](https://heroku.com/deploy)
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## What is this?
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</div>
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The YaCy search engine software provides results from a network of independent peers,
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instead of a central server. It is a distributed network where no single entity decides
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what to list or order it appears in.
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User privacy is central to YaCy, and it runs on each user's computer, where search terms are
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hashed before they being sent to the network. Everyone can create their individual
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search indexes and rankings, and a truly customized search portal.
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## What is YaCy?
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Each YaCy user is either part of a large search network (search indexes can be
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exchanged with other installation over a built-in peer-to-peer network protocol)
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or the user runs YaCy to produce a personal search portal that is either public or private.
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YaCy is a full search engine application containing a server hosting a search index,
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a web application to provide a nice user front-end for searches and index creation
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and a production-ready web crawler with a scheduler to keep a search index fresh.
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YaCy search portals can also be placed in an intranet environment, making
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it a replacement for commercial enterprise search solutions. A network
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scanner makes it easy to discover all available HTTP, FTP and SMB servers.
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To create a web index, YaCy has a web crawler for
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everybody, free of censorship and central data retention:
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- Search the web (automatically using all other YaCy peers)
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- Co-operative crawling; support for other crawlers
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- Intranet indexing and search
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- Set up your own search portal
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- All users have equal rights
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- Comprehensive concept to anonymize the users' index
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Running a personal Search Engine is a great tool for privacy; indeed YaCy
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was created with the privacy aspect as priority motivation for the project.
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You can also use YaCy with a customized search page in your own web applications.
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## Large-Scale Web Search with a Peer-to-Peer Network
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Each YaCy peer can be part of a large search network where search indexes can be
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exchanged with other YaCy installation over a built-in peer-to-peer network protocol.
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To be able to perform a search using the YaCy network, every user has to set up
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their own node. More users means higher index capacity and better distributed
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indexing performance.
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This is the default operation that enables new users to instantly access
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a large-scale search cluster, operated only by YaCy users.
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You can opt-out from the YaCy cluster operation by choosing a different operation
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mode in the web interface. You can also opt-out from the network in individual searches,
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turning the use of YaCy a completely privacy-aware tool - in this operation mode search
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results are computed from the local index only.
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## License
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Michael Peter Christen
7 months ago
