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Comma-separated values
A comma-separated values (CSV) file stores tabular data (numbers and text) in plain text. Each line of the file is a data record. Each record consists of one or more fields, separated by commas. The use of the comma as a field separator is the source of the name for this file format.
An official standard for the CSV file format does not exist, but RFC 4180 provides a ''de facto'' standard for many aspects of it. In popular usage, however, the term CSV may denote some closely related delimiter-separated formats, which use a variety of different field delimiters. These include tab-separated values and space-separated values, both of which are popular. Such files are often even given a .csv extension, despite the use of a different field separator than the comma. This loose terminology creates problems for data exchange.
==Data exchange==
CSV is a common data exchange format that is widely supported by consumer, business, and scientific applications. Among its most common uses is moving tabular data〔(【引用サイトリンク】 title=CSV Files )〕 between programs that natively operate on incompatible (often proprietary and/or undocumented) formats.〔 This works despite lack of adherence to RFC 4180 (or any other standard), because so many programs support variations on the CSV format for data import.
For example, a user may need to transfer information from a database program that stores data in a proprietary format, to a spreadsheet that uses a completely different format. The database program most likely can export its data as "CSV"; the exported CSV file can then be imported by the spreadsheet program.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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