voxel is an analogy of pixel. Pixel stands for picture element, while voxel stands for volume element. I’m assuming that you know what is pixel. In case you don’t: [https://www.bbc.co.uk/bitesize/topics/zf2f9j6/articles/z2tgr82](https://www.bbc.co.uk/bitesize/topics/zf2f9j6/articles/z2tgr82)
There are many ways to model the brain. One way is to decompose brain in terms of voxels, since brain is 3d. You then can get a value for every voxel through various techniques such as MRI, fMRI, CAT, MEG, etc.
In an image, each pixel contains 3 values, each representing colors RGB. A voxel could also contain one or more values, depending on the imaging technique used. One example in BOLD signal in fMRI https://en.wikipedia.org/wiki/Blood-oxygen-level-dependent_imaging
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