What command is used to list files and directories in the current directory?

The command used to list files and directories in the current directory is "ls." This command is a standard command in Unix and Unix-like operating systems, including Linux. Running "ls" without any options displays the names of the files and directories in the current working directory, organized in columns. It is a foundational command that users rely on for navigating and managing file systems within the terminal.

While other commands like "dir" can serve a similar purpose in different contexts or operating systems (like Windows), "ls" is specifically designed for use in Linux and other Unix environments, making it the primary command for this function in those systems. The other options, "list" and "show," do not correspond to standard commands for listing files and directories in Linux, further confirming that "ls" is the correct answer.