A postcard is thick paper. 

A postcard is a piece of thick paper. 

Long ago, people wanted a fast way to talk. Postcards became very popular. Some cards had pretty pictures on them. These pictures could be of far-off places.
Many people liked to collect them. Some cards even had ads on them. People sent them to friends and family. It was a fun way to share news. 
In the past, many cards were sent by soldiers. They used them to write home. This helped them stay in touch.
Today, we still see colorful postcards. They are a great way to say hello.
A postcard is a piece of thick paper or cardboard. 

People have sent cards with messages for a long time. The first known picture postcard was hand-painted. A man named Theodore Hook sent it to himself in 1840. In 1861, John P. Charlton made the first commercial card. 
Postcards became very popular later. This was called the "golden age." During this time, billions of cards were mailed. In the United States, nearly a billion cards were sent every year from 1905 to 1915. 
Some people study and collect postcards. This study is called deltiology. Today, many people use social media to talk. Because of this, fewer people buy postcards than before. We still see many colorful "chrome" postcards today. These are glossy cards that we see often.
A postcard is a piece of thick paper or thin cardboard. 

There are two main types of cards to know about. Collectors call them postcards if you must add your own postage stamp. They call them postal cards if the postage is already printed on them. 
People have sent cards with messages for a very long time. The earliest known picture postcard was hand-painted by Theodore Hook in 1840. 
Postcards entered a "golden age" between 1890 and 1915. 
Postcard styles have changed many times over the years. In the 1930s, people used "linen" cards with a special printing process. 
A postcard is a piece of thick paper or thin cardboard. 

Collectors distinguish between two specific types of cards. A postcard requires a postage stamp to be mailed. A postal card has the postage pre-printed on it. 
The history of these cards began with individual efforts. The earliest known picture postcard was hand-painted by Theodore Hook. He posted it to himself in 1840 from Fulham, London. The card featured a caricature of post office workers. 
Official postal cards grew due to military and government needs. In 1865, Heinrich von Stephan proposed an "open post-sheet." He wanted one side for addresses and one for messages. Officials rejected this idea because they feared a loss of privacy. However, Austria-Hungary accepted a similar idea in 1869. They mailed 3 million cards within three months. During the Franco-Prussian War in 1870, Germany issued postals for soldiers. This allowed troops to send inexpensive messages from the field.
Many nations adopted postal systems throughout the 1870s. Great Britain, Switzerland, and Canada introduced postals during this era. The first printed picture postcard appeared in France in 1870. 
Postcards entered a "golden age" between 1890 and 1915. This era was driven by new photography and mass production. The Chicago World's Fair in 1893 helped popularize souvenir postals. In the United States, the government lowered the postage rate in 1898. This change caused a massive boom in the private industry. 
Economic and political shifts eventually ended this golden age. In 1909, the Payne-Aldrich Tariff Act placed taxes on German imports. This made high-quality German cards more expensive in America. Hostilities in Europe also made it hard to import ink and cards. World War I disrupted production, though cards were still used for propaganda. As telephones became common, the demand for postcards began to fall.
Postcard styles have evolved through several distinct stages. Between 1915 and 1930, "white border" cards became common in the United States. These used less ink than previous versions. In the 1930s, "linen" postcards used a new printing process. 

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