It depends. are you talking about buying like add-on cards? buying a headset? upgrading to a blu-ray? or building an entire computer? Since you weren't very specific, i'll answer all 4.
1. For add on cards (sound cards, graphics cards, etc) there aren't very many limits , but there are some. Such as power supply (do NOT want to be under powered), and slot availability (pci/pci-e).
2. for headsets, as long as the manufacturer of said headset makes the drivers for whatever operating system you're running, you're good.
3. blu-ray drives, or any other optical drives, don't have very many limits either. Make sure your power supply has the proper cables to provide power, make sure you have the proper data cables to connect to your mobo. and of course make sure it fits in your case.
4. Building a computer is obviously more complicated than the other 3 but not too difficult at all. i would say start with deciding which processor you want and then build off that. (cpu cooler if necessary, mo.bo., ram, hdd/ssd, graphics card, odd, power supply, etc.) for the processor it really all depends on what you are going to be doing with said computer. if you are only going to be word processing or Surfing the web, a core i3 would be sufficient. however the other extreme would be video editing and 3D modeling for which i would say ATLEAST a core i7 2600k, but more likely a i7 3930k. if you're somewhere in between well get something in between.
Hope I helped,
TehShowstopper
A monitor is not normally considered hardware, the internal components of a computer are considered hardware.
Hardware
hardware
The case is not normally considered computer hardware. However it is "hardware" in the same sense things that you buy in a Hardware Store are hardware (e.g. sheet metal, angle brackets, screws, washers, nuts, nails, plastic, paint).
A "diskette" or "floppy disk" is neither as they are removable magnetic storage media. However, if you refer to the drives that read from them or write to them, then those drives are considered hardware.
A monitor is not normally considered hardware, the internal components of a computer are considered hardware.
is a standard modem considered to be a computer hardware
Hardware
A flash drive is hardware.
A Disk on Key is hardware.
its hardware that contains firmware
Purchasing bonds for the expansion of a software firm would be considered?
Yes a cpu would be considered hardware since it is tangible.
No, it is a software application that runs on hardware.
Memory chips are considered to be hardware. Compute hardware is considered to be any physical component. This also includes things such as the keyboard, mouse, monitor, and hard drive.
Memory chips are considered to be hardware. Compute hardware is considered to be any physical component. This also includes things such as the keyboard, mouse, monitor, and hard drive.
No. Firmware is a special piece of software on a device that controls it. The modem is considered only a hardware device.