Counters keep track of visitors to sites. When a person visits, the counter goes up one digit. They can be in the form of plain old simple counters, invisible counters and counters that log data on visitors.
They are useful because they allow sites to know who/when and if people are visiting.
RSS stands for really simple syndication. Essentially it is an easy way to subscribe to information from websites. That way updates to the sites/itunes/email are sent to you without visiting the site. You receive headlines, allowing you to see the updates whihc you can then choose to view should you want to.
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