Definition: SDF

(Standard Data Format) A simple file format that uses fixed length fields. It is commonly used to transfer data between different programs.

 Pat Smith   5 E. 12 St.   Rye        NY
 Ed Jones    20 Main St.   New Hope   PA


CSV
In contrast to SDF, the comma separated values (CSV) format uses variable length fields.

 "Pat Smith","5 E. 12 St.","Rye","NY"
 "Ed Jones","20 Main St.","New Hope","PA"