Solr is a robust standalone search server solution with an intuitive REST-like API interface. It facilitates the process of inputting 'documents' (a process known as 'indexing') through JSON, XML, CSV or binary data via HTTP. Response retrieval can also be done through HTTP GET requests to receive results in formats such as JSON, XML, CSV or binary.
Solr stands out with its advanced Full-Text Search Capabilities. These extensive features allow for powerful matching capabilities across any data type - including phrases, wildcards, joins and grouping among others. This makes it a versatile tool for handling various data structures and search requirements.
In addition to this, Solr prides itself on its adherence to Standards Based Open Interfaces such as XML, JSON and HTTP. This ensures seamless integration with the tools developers commonly use, simplifying the application development process immensely.