DICOMweb
DICOMweb is the collective name for DICOM's RESTful web services — WADO-RS for retrieving, QIDO-RS for querying and STOW-RS for storing — which carry DICOM data over HTTP instead of the traditional DICOM network protocol.
What DICOMweb means in practice
The services do the same jobs as their older counterparts but over ordinary web requests, which is what makes browser-based viewing practical without a plug-in. QIDO-RS corresponds to a query, WADO-RS to a retrieve and STOW-RS to a store. "DICOMweb" is the standard's own shorthand for the set rather than a separate specification.
Source
This definition follows NEMA PS3.18 — Web Services, published by NEMA as part of the DICOM standard.
Related terms
Query/Retrieve (C-FIND and C-MOVE)
Query/Retrieve is the pair of DICOM services used to search what a remote device holds and then pull matching studies from it: C-FIND performs the search and C-MOVE transfers the results.
C-STORE
C-STORE is the DICOM network service used to transfer a composite object — an image or similar instance — from one device to another, and it is the operation behind "sending a study" to a PACS.
PACS
A PACS is a system that stores, retrieves, distributes and displays medical images, connected to imaging modalities and viewing workstations over a DICOM network.