adding usage part

thepostalsystemexplained/index.md

@@ -41,3 +41,31 @@ Each country operates its own national postal system. Examples include the USPS
 
 International cooperation between different national postal systems facilitates the exchange of mail across borders. For instance, the Universal Postal Union (UPU) plays a key role in coordinating global postal standards, ensuring seamless mail flow between countries.
 
+## **Why is it used for?**
+
+The postal system serves a wide range of purposes. With the rise of email, most people no longer rely on the postal system for sending letters. However, it is still widely used by organizations around the world. Governments, for example, often use postal mail to send tax notifications, legal notices, or other important documents to the public.
+
+The growth of online shopping has led to a significant increase in the volume of packages sent via the postal system. This includes both purchases and returns. Some individuals also use the postal service to sell goods outside of traditional economic systems or to ship personal items, like furniture, to recipients who are far away.
+
+![](packages.png)
+
+One thing that’s become less common is sending postcards, as the internet now allows people to share photos and messages instantly and for free.
+
+Despite the digital age, most legal and official documents are still sent via the postal system, as these often require signatures, and electronic signatures are not yet widely trusted by many organizations.
+
+Magazines, newspapers, catalogs, and advertising materials are still primarily sent through the postal service. Many people still prefer reading these physical items rather than online versions.
+
+Certain types of payments, such as checks, continue to be sent through the postal system, though cash is generally not used due to government control issues. This is one of the reasons cryptocurrencies like Monero (XMR) are gaining popularity for private, "under-the-radar" transactions.
+
+![](xmr.png)
+
+In some countries, prescription medications and medical supplies can be sent through the postal system, although this is not universally available.
+
+For urgent deliveries, services like next-day or same-day delivery are often used to send important documents or goods quickly.
+
+Postal systems are also essential for sending biological samples, research materials, or test kits to laboratories for analysis or clinical trials.
+
+![](usagegraph.png)
+
+As you can see, the postal system is still a major part of people's lives. This is precisely why governments make every effort to maintain control over it. By doing so, they are able to regulate what, when, and where you receive mail.
+