My blog have 360 Unattached images what does it mean?

  • i have a blog name NXTTECH you can go here to see it.
    Recently i found that 360 images are Unattached and they take huge disk space and i decide to remove them but before i remove i want your suggestion so my question is
    1.does they are unnecessary?
    2.If i remove them, So does they affect posts?
    3.If i remove them, then does they affect my links?

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