CSV (Comma-separated values) is a text file format that uses commas to separate values, and newlines to separate records.
A CSV file stores tabular data (numbers and text) in plain text, where each line of the file typically represents one data record. Each record consists of the same number of fields, and these are separated by commas in the CSV file. If the field delimiter itself may appear within a field, fields can be surrounded with quotation marks.
Here are some CSV conversion tools, Convert data between CSV and other file types, between CSV and databases, Merge CSV files, Split CSV files.