curland first shows the main version number of the tool. Then follows the "platform" the tool was built for within parentheses and the libcurl version. Those three fields are common for all curl builds.
-DEVappended to it, it means the version is built straight from a in-development source code and it is not an officially released and "blessed" version.
nghttp2/1.41.0. This can for example tell you which TLS backends this curl uses.
CURL_SSL_BACKENDenvironment variable) the one listed without parentheses will be used.
[unreleased]if curl was built another way than from a release tarball, and as you can see above that is how Microsoft did it for Windows 10 and the curl project does not recommend it.