Offices rely on computers to carry out the core administrative and professional work of an organisation. This work primarily involves gathering information, analysing it, and producing reports, proposals, and records that support decision-making and daily operations.
Tasks such as compiling data, preparing documents, analysing figures in spreadsheets, and looking into market or organisational information are all forms of research in the broad sense of purposeful information-gathering and analysis carried out to support the office's work. This is why computers in an office setting are majorly used for research purposes, in addition to routine tasks like communication and record keeping that stem from that same information-driven work.
Recreational use, such as playing games or watching entertainment content, is not the primary purpose of office computers, even though it may happen informally. Storage and security are supporting functions computers provide everywhere, in offices and elsewhere, but they describe features of computers rather than the main reason offices use them.
Exam reminder: connect the majority use of office computers to the professional, information-driven work of the organisation rather than to incidental features like storage or entertainment.