Most modern cell phones have the ability to send and receive short text messages. This is usually called short message service (SMS) or text paging — or just “texting” for short.
With SMS, you enter a message using your cell phone’s keypad. With most carriers, you’re limited to very short messages — 160 characters at the most.
Once you’ve finished your message, you can send to to anyone else’s cell phone by entering their phone number. Off the message goes, and in a few seconds to a few minutes, your friend’s phone will beep and the message will appear on their screen.
You can also use SMS to send email messages from a computer to a cellphone, or from a cellphone to a friend’s email account.
This site has many articles that can help you get the most out of your text messaging. Here are some articles explaining the basics in more detail: