Cancels, Postmarks, and Obliterations (Stamp Collecting)

What is a postage stamp? Why are they cancelled? Are cancelled stamps more valuable? PODCASTS Bob Collects Stamps; https://bob-collects-stamps.pinecast.co Bob Collects Stamps Blog; https://bobcollectsstamps.wordpress.com/ Tip Jar: https://tips.pinecast.com/jar/bob-collects-stamps Buy me a Ko-fi: https://ko-fi.com/bobcollectsstamps