A 3-dimensional Euclidean space (which is normally what is being referred to if talking about a Euclidean space) is basically the space in which we live (excluding relativistic effects), where moving and rotating things don’t change them and you can use Cartesian coordinates to say where things are. The 2-dimensional Euclidean space is basically a plane, and a 1-dimensional Euclidean space is basically a straight line. Other dimensions of Euclidean space are allowed.
Source: “Euclidean space,” Wikipedia, retrieved 6/10/2020
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Disclaimer:
I am not a professional in this field, nor do I claim to know all of the jargon that is typically used in this field. I am not summarizing my sources; I simply read from a variety of websites until I feel like I understand enough about a topic to move on to what I actually wanted to learn. If I am inaccurate in what I say or you know a better, simpler way to explain a concept, I would be happy to hear from you :).
