So imagine you have a special piece of paper that says you borrowed some money from someone. But you don't have to pay it back right away, you can take your time. That piece of paper is called a bond.
Now, sometimes people want to keep that piece of paper for a really long time, like for 100 years or more! They want to keep it safe so they put it in a special place called an archive. And because they want to keep it safe for so long, they use a special kind of bond called an archival bond.
This kind of bond is made with special materials that won't damage or break down over time. That way, even after 100 years, that special piece of paper will still look good and have all the important information on it.
Archival bonds are important because they let people keep important records and information safe for a really long time.