CSV is the most common data format for spreadsheets, while HTML can be used to display webpages.
CSV (Comma-Separated Values) is a file format that stores tabular data - rows and columns. It can be exported from a spreadsheet or database program and imported to other programs.
A CSV file consists of any number of records, separated by commas, with each record consisting of fields separated by a comma or a semicolon. Fields in each record are identified by their name, which is not surrounded by quotes or other characters.
A CSV file should have one field that contains the names of the other fields for that record.
HTML is best known as the language used to create web pages, but it’s also the default format for displaying web content within other programs, such as word processors and email clients.