Is EOS public or private?

Could you please clarify for me whether EOS is categorized as a public or private blockchain? I've heard conflicting opinions on this matter and am interested in understanding the fundamental differences between the two categories, as well as how EOS specifically fits into this classification. Could you provide some insight into this, including any key characteristics or functionalities that make EOS unique in this regard? Thank you for your assistance in clarifying this question for me.