# What is Bandwidth and Why is 3 dB Important?

• snshusat161
In summary: Frequency spectrum is a graphical representation of the frequency distribution of a signal. It can be used to see how the energy in the signal is distributed.
snshusat161
please explain it in easy language. explain other terms (like freq. spectrum) if u'll use. nd y there is always 3 db shown in its diagram.

In general terms it describes the frequency interval in which most (or, sometimes, a defined proportion) of the energy of a signal is transmitted.
For a straightforward sort of signal, if you plot the spectrum, then the bandwidth is often quoted as the interval between the frequencies where the average spectral level is half the maximum level. That is 'between the 3dB points'.
You can only talk usefully in these terms for signal with a spectrum that is 'single humped'. It needs to be more tightly specified to be of use when describing other types of signal.

totally confused! so much of technical language. please tell what is frequency spectrum. use everyday language. no matter if the definition is not so precise.

It's kind of like a garden hose; the bigger it is, the more water (or in this case, data), it can transfer at a given speed.

I think it might be best to read the Wikipedia pages on the terms you don't know. As I don't know what you don't know, I really don't know how to start to answer your original, very general, question.
You are expecting a lot if you want to understand about something that comes half way through studies on oscillations and waves and don't have the basics. Wikipedia doesn't usually insist on a lot of prior knowledge in it's treatment of basic terms.

zgozvrm said:
It's kind of like a garden hose; the bigger it is, the more water (or in this case, data), it can transfer at a given speed.
I have to admit; that is a very good start!

## 1. What is bandwidth?

Bandwidth refers to the maximum amount of data that can be transmitted over a network or communication channel in a given amount of time. It is typically measured in bits per second (bps) and is a key factor in determining the speed and performance of a network.

## 2. How is bandwidth different from speed?

Bandwidth and speed are often used interchangeably, but they are not the same thing. Bandwidth refers to the maximum capacity of a network, while speed refers to the actual rate at which data is transferred. In other words, bandwidth is the potential, while speed is the actual performance.

## 3. What factors can affect bandwidth?

There are many factors that can affect bandwidth, including the type of network, the quality of the network equipment, the amount of traffic on the network, and the distance between the sender and receiver. Other factors such as interference, signal strength, and network congestion can also impact bandwidth.

## 4. How is bandwidth measured?

Bandwidth is typically measured in bits per second (bps). There are different units used to express bandwidth, such as kilobits per second (kbps), megabits per second (Mbps), and gigabits per second (Gbps). The higher the number, the greater the bandwidth and the faster the data can be transmitted.

## 5. Why is bandwidth important?

Bandwidth is important because it directly affects the speed and performance of a network. A higher bandwidth allows for faster data transfer, which is essential for activities such as streaming videos, downloading large files, and online gaming. It also helps to prevent delays and buffering, resulting in a better user experience.

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