1. In computing, the default source of input data for a program, typically the keyboard
The program reads data from standard input.
O programa lê dados da entrada padrão.
2. A stream in operating systems (often represented as stdin or file descriptor 0) that allows users or other programs to send data to a running process
You can redirect a file to standard input using the < operator in Unix.
Você pode redirecionar um arquivo para a entrada padrão usando o operador < no Unix.