A mail client refers to a program used to read, write, and send emails. To display an email, an email program can either download emails from a mail server, access a locally stored mailbox, or edit emails directly on the server. When sending an email, the user's email program typically sends it via SMTP (Simple Mail Transfer Protocol) to an SMTP relay server, which then forwards the email for delivery.

With WAP, you can easily browse the internet with your mobile phone, search for an address online, make a reservation at your favorite restaurant, or find the nearest gas station. The Wireless Application Protocol (WAP) is a collection of technologies and protocols aimed at making internet content available for mobile phones and their small displays.

Thanks to Bluetooth technology, mobile devices wirelessly exchange data with other compatible devices over short distances, typically up to about 10 meters. Bluetooth is an industry standard that enables data transmission at no cost and with low power consumption. Mobile devices can support video formats such as MPEG4, H.263, H.264, and WMV. MPEG4, H.263, and H.264 are standards that describe methods for video and audio data compression. H.264 is an advancement that typically achieves higher encoding efficiency than H.263 and is also designed for high-resolution image data, such as HDTV. WMV (Windows Media Video) is a proprietary video codec from Microsoft and is part of the Windows Media platform. WMV is structurally similar to MPEG4.