The file extension or file header of the archive file are indicators of the file format used. Computer archive files are created by file archiver software, optical disc authoring software, and disk image software. Archive formats. An archive format is the file format of an archive file.
Definition of sewage for English Language Learners. : waste material (such as human urine and feces) that is carried away from homes and other buildings in a system of pipes.
The term sewage is nowadays regarded as an older term and is being more and more replaced by wastewater. In general American English usage, the terms sewage and sewerage mean the same thing. In American technical and professional English usage, sewerage refers to the infrastructure that conveys sewage.