Skype is a online communication program that allows you to communicate with other Skype users, make phone calls to landlines and cell phones, record your calls, and even video conferencing. The program is quickly gaining popularity on the business front, and has been around since 2003. The program is free to download and install from the Skype web site, and with just a few clicks, you'll be up and running in no time.
Your firewall protects you from hackers and malicious software such as spyware and viruses. However, your firewall may look at Skype with suspicion--as if it's an intruder to your computer--causing Skype to misbehave. You can overcome difficulties by configuring Skype to pass through your firewall.