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This is an hindrance to the further development of AI. Federated learning has emerged as a possible solution to this problem in the last few years without compromising user privacy. Among different variants of the federated learning, noteworthy is federated transfer learning (FTL) that allows knowledge to be transferred across domains that do not have many overlapping features and users. In this work we provide a comprehensive survey of the existing works on this topic. In more details, we study the background of FTL and its different existing applications. We further analyze FTL from privacy and machine learning perspective.<\/jats:p>","DOI":"10.3233\/ia-200075","type":"journal-article","created":{"date-parts":[[2021,7,30]],"date-time":"2021-07-30T10:54:35Z","timestamp":1627642475000},"page":"35-44","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":100,"title":["Federated transfer learning: Concept and applications"],"prefix":"10.1177","volume":"15","author":[{"given":"Sudipan","family":"Saha","sequence":"first","affiliation":[{"name":"Data Science in Earth Observation, TechnicalUniversity of Munich, Taufkirchen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tahir","family":"Ahmad","sequence":"additional","affiliation":[{"name":"Security & Trust Unit, Fondazione Bruno Kessler, Trento, 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