A newsreader is a special computer program that helps you read and send messages on Usenet. Usenet is like a big library full of information that people have posted on the internet. Just like how you can go to the library to borrow books or read newspapers, you can use a newsreader to access Usenet and read or post messages, which are often called "news articles".
Think of a newsreader like a special kind of bookshelf that organizes all the news articles on Usenet into different categories or "newsgroups". You can choose which newsgroups you want to read or contribute to, and the newsreader will show you all the news articles in that group.
Newsreaders can be simple or more advanced. Some newsreaders are like a basic bookshelf that just shows you the titles of the news articles in each newsgroup. Others are more advanced and allow you to search for specific topics or keywords, filter out certain types of content, or even preview images or videos that are attached to news articles.
Overall, a newsreader is a useful tool for exploring and participating in the vast world of Usenet. It helps you to organize and keep track of all the different news articles on different topics, and allows you to contribute your own thoughts and ideas to the community.