Bitmap Images Explained

At first glance, bitmap images look rather like grayscale artwork. However, scrutinise them further. They only have one channel of data, and if you've heard of the term binary data, this is quite literally the visual representation of that. Where we have one for the data that's represented in pixel is black. Where there is no data zero, it's shown as white.
Although these days limited in the use, bitmaps can be used for line art or to create halftone print effects as well.
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I would call this a 1bpp (one bit per pixel) image, not a bitmap. Bitmap almost always means any sort of raster image in my world. I've never before encountered a case where bitmap refers to images with one bit per pixel.