A guitar can be classified as a stringed instrument.
This is such because its sound is produced from the vibrations of the strings. Interestingly enough, and as expected, guitars have many different types of strings however generally speaking there are 2 main types: steel and nylon.
Steel strings are used on both electrical and acoustic guitars, while nylon strings are primarily used for classical and flamenco guitars.
Even though these strings are made with either steel or nylon, they're almost always wound with either nickel , brass or copper alloys.
For most standard strings on an electrical guitar, only the 4th, 5th and 6th strings are wound. Some guitars have up to 12 strings and so, of course, they will be tuned differently from standard guitars.
Each string does not have the same thickness as a different note is required from each of them. Electrical guitar strings that are wound are created by rolling a white metallic string around another string located centrally.
The materials used in the wrapping of the central string depend on the durability and the tone needed by the musician, however, typically nickel or nickel alloy is used.
Now that you understand the general basics of guitar strings and their differences, it's time to move on to analyzing the strings a bit more in depth.
This will allow you (as the player) to determine which style and type of string you need to best suit your needs and playing style,