Yahoo! Messenger - Instant messaging allows you to quickly exchange messages with your online friends. Unlike e-mail, instant messages appear as soon they`re sent. By downloading the Yahoo! Messenger application to your computer, you can send instant messages to other people from around the globe, send them files or have a voice conference.

Other features include voice chat, file transfer, mail and stock quote alerts, sports scores, news, and much more.

Here are some key features of "Yahoo! Messenger":
Photo Sharing:
· Drag-and-drop photos into your IM windows and talk about them like you're there.

LAUNCHcast Radio:
· Make your own radio station and listen to music you like!

Yahoo! Games:
· Challenge your friends to classic Yahoo! Games in the IM window.

IMVironments:
· Use interactive themed backgrounds in your IMs.

Find, Add, Share Friends:
· Easily get connected with the people who matter most.

Yahoo! Search:
· Search from your IM window, and get results both you and your friend can see.

File Transfer:
· Drag-and-drop files for real-time sharing and instant notification that they've been received.

Address Book:
· Synchronize all your contact information.

Stealth Settings:
· Make yourself appear online to some and offline to others.

Audibles:
· Let these animated characters say it out loud for you!

Emoticons:
· Express your feelings with these animated smiling faces.

Yahoo! Avatars:
· Represent yourself with a stylized graphical image.

Display Images:
· Select an image to represent yourself to your friends.

Skins:
· Select new visual designs or disable them altogether.

Voice:
· Make free worldwide PC-to-PC calls and enjoy great sound quality and voice mail.

Take Yahoo! with You:
· Stay connected to Yahoo! Messenger on your mobile phone.

Webcam:
· Share live video with friends and family around the world.

Conference:
· Exchange text messages with multiple people in one IM.