When you take photos using JPEG and TIFF, it is necessary to set the white balance before taking a picture.
However, when you take RAW data photos, it is possible to adjust the white balance afterwards during development similar to before taking a picture.

The proper white balance setting is very important because it greatly affects the whole picture.
However, this takes time and it is sometimes very difficult to set the proper white balance before taking a picture.

Of course, you can adjust the color afterwards in JPEG format, but you cannot adjust it perfectly.
If you use RAW data photos, you can take pictures without having to worry about the white balance setting.