A guitar amplifier is a piece of equipment that an electric guitar is plugged into. The purpose of this is to amply the sound from what it originally is. At the same time though you need for it to sound just the same without any additional vibrations or distortions. This means you will need to invest in a quality guitar amplifier in order to benefit from it. Some bands sound awful and it isn't due to their playing but instead to the amplifier they are using.
The quality of guitar amplifiers has certainly improved since they were first introduced in the 1930's. Still, they continue to be a very important part of the music industry. A guitar amplifier is a standard piece of equipment for small time bands as well as those that are known around the world. In fact, many bands use guitar amplifiers to be able to get more volume from other types of instruments as well. Yet if you are planning to amplify a bass, keyboard, or other instrument you will get a better sound if you get what is specifically built for that instrument.
One reason why so many people choose to use guitar amplifiers though for their other instruments has to do with the cost of them. They aren't able to afford to get the right equipment they need for everything. As a result they simply do what they can with the resources they do have readily available. You have to be careful though not to overload a guitar amplifier though. Otherwise it will be defective and you will have to spend money to replace it. Pay close attention to what the load is for any given guitar amplifier to prevent this from happening.
A guitar amplifier can offer you between 20 and 50 watts of power. This is an important aspect to watch out for. If you plan to play some very heavy rock and roll then you will need to go with the more powerful amplifier. The more power you get the more expensive they will be. Yet you can often get your hands on some good quality guitar amplifiers that have been used. They will still offer you value and you can same some money in the process.