Rendezvous is when two people agree to meet up at a certain time and place. In Plan 9, which is a computer operating system, programs can also have a rendezvous. Instead of people, programs have rendezvous with each other to share information or work on tasks together.
Just like when you agree to meet someone, programs in Plan 9 also need to agree on a certain time and place to rendezvous. This is done by using special code that tells each program where to meet and what to do.
Once the programs meet, they can exchange data or work together to complete a task. This helps the programs work more efficiently and get things done faster.
So, just like how you meet your friend at the playground to play together, programs in Plan 9 can meet at a rendezvous location to work together.