The Standard SDK provides a cross-development toolchain and
libraries tailored to the contents of a specific image.
You would use the Standard SDK if you want a more traditional
toolchain experience as compared to the extensible SDK, which
provides an internal build system and the
devtool
functionality.
The installed Standard SDK consists of several files and directories. Basically, it contains an SDK environment setup script, some configuration files, and host and target root filesystems to support usage. You can see the directory structure in the "Installed Standard SDK Directory Structure" section.