One example are JSON/XML/HTML responses over HTTP: you need the 8-bit ("binary") data in an ASCII format to fit into JSON/XML/HTML, while HTTP provides gzip (or

One example are JSON/XML/HTML responses over HTTP: you need the 8-bit ("binary") data in an ASCII format to fit into JSON/XML/HTML, while HTTP provides gzip (or DEFLATE, Brotli, etc.) compression over the whole response if both the client (by including the "Accept-Encoding" header in the request) and the server implementations support it.