The workshop introduces Cytoscape (https://cytoscape.org/) – an open source platform for retrieval and visualization of complex biological interactions that are available from public interaction resources: The IMEx Consortium (https://www.imexconsortium.org/), STRING (https://string-db.org/) and BioGIRD (https://thebiogrid.org/). It covers querying for interactions data using built-in search interface, interaction data cleanup and visualization as well as overlying of the in-house generated data (eg. gene expression levels) on top of the imported reference interaction network. The workshop will also provide an overview of the experimental methods of interaction determination and of the information available from the interaction resources, both necessary to critically evaluate imported interaction networks.