Which character signifies the starting point for a series of request query parameters in a URI string?

The question mark signifies the starting point for a series of request query parameters in a Uniform Resource Identifier (URI) string. For example, the URI string might look something like this: https://server/path/api?para1=test1&para2=test2. The backslash is not used in a URI. The forward slash helps delimit the various components of a URI. The ampersand delimits the various request query parameters if there is more than one.