The most popular Operating Systems are:
Android
IOS
Windows
Answer: my suggestion is to ask a teacher and do research like look up the best shoe companies and things like that
Explanation:
An audio file format is a file format for storing digital audio data on a computer system. The bit layout of the audio data (excluding metadata) is called the audio coding format and can be uncompressed, or compressed to reduce the file size, often using lossy compression. The data can be a raw bitstream in an audio coding format, but it is usually embedded in a container format or an audio data format with a defined storage layer.
No they are images that are free to use as long as your not using them to make profit and you give credit to the person who owns the image.
