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They're both the same because they can be plugged in and they're different because they are used is different ways.
When in a recording studio, there is a complex mix of wires, outs and ins that are all connected into itself. Usually, all the inputs (guitars, microphones, amps etc) all join connect to the mixing desk (which is outside the studio, usually a pane of sound proof glass is between the studio and the mixing room). The desk then sets all the instruments and microphones to certain levels (volumes) and lets microphones to be plugged into them. These microphones go back inside the studio to let the performers hear what they are singing and playing without affecting the sound in the studio.
Sound cards have a standard operation for controlling sound on computers--of processing the input and output of sound. The input comes from other devices such as microphones or MIDI musical instruments. The sound card takes the sound from the device, records it and then processes it. For output, the device takes instructions from the program and plays the sound through speakers connected to the computer. The different types of sound cards include; Motherboard Sound Chips Standard Sound Cards External Sound Adapters
Sound is collected by microphones, which are devices that convert sound waves into electrical signals that can be processed, stored, and reproduced. Microphones can come in various types, such as dynamic, condenser, and ribbon microphones, each with its own characteristics suited for different applications.
By microphones, amplifiers and loudspeakers.
Sound cards capture analog audio signals from microphones, music compact disks, musical instrument digital interface (MIDI; such as electronic-piano keyboards) devices, and other sound sources
Omni-directional microphones are meant to pick up sound from any direction at any time. Unidirectional microphones pick up sound from only one direction.
A PC doesn't have to have cards. everything is integrated. but if you want to play titles such as Oblivion, or hook into a network, they're a necessity. Graphic and sound cards drastically improve your graphics and audio. NIC's will allow you to connect to the internet, networks. And you can also use cards to create addtional ports for w/e u want
Microphones
The mother boards is where all this cards are connected. sound, graphics etc... all connect in the mother board so the answer is yes.
The sound pressure moves the human ear drums and also the diaphragms of the microphones. A sound wave is transformed by the microphone to an electric voltage wave, which is amplified by a microphone pre-amplifier.
video and sound cards