Make FIFOs (named pipes). More information: https://www.gnu.org/software/coreutils/manual/html_node/mkfifo-invocation.html.
mkfifo {{path/to/pipe}}
echo "{{Hello World}}" > {{path/to/pipe}} &
cat {{path/to/pipe}}
mkfifo {{path/to/pipe}}; script {{[-f|--flush]}} {{path/to/pipe}}