e) Operator of the information system means a public authority or legal or natural person that determines the purpose of the processing of information and the conditions for the operation of the information system f) Operator of the communication system is a public authority or legal or natural person, that determines the purpose of the communication system and the conditions for its operation g) Administrator of the information or communication system is a public authority or legal or natural person that ensures the functionality of technical and software tools that constitute the information or communication system h) Important network means an electronic communication network1) providing direct international connectivity to public communication networks or providing direct connection to a critical information infrastructure i) Essential service means a service the provision of which is dependent on electronic communication networks7) or information systems, and the disruption of which may have a significant impact on the security of societal or economic activities in any of the following sectors: 1. Energy 2. Transport 3. Banking 4. Financial market infrastructures 5. Health sector 6. Water resource management 7. Digital infrastructure 8. Chemical industry j) Information system of essential service means an information system on which the provision of an essential service is dependent k) Operator of an essential service means a public authority or legal or natural person that provides the essential service and is identified by the National Cyber and Information Security Agency (hereinafter “the Agency”) according to Section 22a; for the purposes of meeting the information obligations according to the relevant legal regulation of the European Union8), also public authorities and legal or natural persons specified in Section 3, letters c) and d) are considered to be the operators of an essential service l) Digital service means a service of information society according to the Act on Certain Information Society Services9) that consists of the provision of: 1. An online marketplace that enables consumers and/or traders to conclude online sales or service contracts with traders10) either on the online marketplace's website or on a trader's website that uses computing services provided by the online marketplace 2. A search engine that allows to perform searches of, in principle, all websites on the basis of a query on any subject in the form of a keyword, phrase or other input, and returns links in which information related to the requested content can be found, or