What kind of data can you pass to a remote server using Curl's -d option?

Using Curl's -d option allows you to send both strings and files to a remote server. The -d flag is typically used to send data in a POST request when communicating with a web server. The data you pass can be in various formats, including plain text strings, URL-encoded strings, or even the contents of files when specified correctly.

For example, if you use the -d option with text data, such as key-value pairs ("key=value"), it sends that data as part of the request body. Additionally, you can specify files to be uploaded as well, enhancing the breadth of scenarios where -d can be utilized.

This flexibility ensures that developers can work with various data types and use cases, making Curl a powerful tool for HTTP requests and interactions with APIs.