Computer science

A Wi-Fi router is a device that allows for network connectivity to multiple Wi-Fi communication capable clients. Wi-Fi signal degrades with distance, as well as different type of medium may impact Wi-Fi signal. Wi-Fi standard went over several iterations over the years. Wi-Fi offers greater flexibility over wired connection. Wi-Fi communications can be encrypted with different strength levels of encryption. Weak encryption can be easily be broken. Most of modern laptop computers come with Wi-Fi functionality built-in into them. Desktop computers may require a Wi-Fi card. Alternative to wireless connection is wired connectivity. YouTube video

A hot-spot device can be used to provide Internet connectivity to Internet capable devices via Wi-Fi. Use of hot-spot devices can be limited or restricted by a mobile company. YouTube video

Wireless connectivity went through several phases of increasing speed. I will not cover legacy connectivity standards. Commonly used connectivity methods today are: 3G, 4G and LTE. YouTube video

The term SIM stands for Subscriber Identity Module. It is small factor card that is inserted into a mobile phone or other mobile device to allow mobile communications. Modern mobile phones have eSIM card, eSIM card is a programmable card that is build-in directly into a device hardware, eSIM card removes a need for a physical SIM card. Use of eSIM card allows phones to be smaller. YouTube video

Wireless connection is a method of computing device network connectivity without using network cables. It is a preferred way of connectivity for notebook computers or tablets. Desktop computers may use wireless connectivity too. Server computers usually use wired connection for greater speed, reliability and privacy. YouTube video

Drawing pads are used to provide digital input to a computer, of the thing a person draws. Drawing pad looks like a big touch pad. Drawing pads often support pressure sensitivity, meaning the harder a person presses digitizer, the thicker the line will be. Drawing pads vary in size. Usually the bigger the digitizer is, the easier to draw high quality graphics. Larger digitizers are usually more expensive, then smaller versions. Digitizers are mostly used by professionals that perform serious graphical work. Regular computer users usually don't need nor don't use one. YouTube video