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The illustration shows examples of 2 warp yarns. Both have 4 warps per inch or ends per inch. (4 EPI) Note: warps are often called “ends”. Hence: 4 epi or 4 ends per inch.
Here a yarn is wrapped around one inch on a ruler. The number of wraps per inch in this case is 15. We might say 15 WPI. You can wrap the yarns on a ruler fairly far apart, so they just graze one another, or so the yarns are squashed together. I suggest wrapping the yarns somewhere between these two options; that is, touching one another very closely, but never overlapping.
Compare this illustration with the first one. This illustration represents wrapping—you can see that the threads touch each other. In the first illustration there are spaces between the warps which is what you would see on the loom. Unless a project is warp faced, there is always some space between the warps on the loom. The number of warps in an inch is called the sett or EPI.
The spaces between the warps in the illustration allow for the wefts to intersect. In this case we have the same yarn for the warp and the weft and a balanced weave with the same number of warps per inch as wefts per inch. (That does not always need to be the case.)
Following the previous illustration, here we see that the wefts take up the spaces between the warps. That’s why there can only be 2 warps per inch (EPI) when there are 4 wraps per inch for this yarn.
It has been determined that there should be 2 EPI (warps per inch). Notice the dotted circles at the top of the illustration: they represent the WRAPS of the warp yarn in an inch. I hope you see the difference now: the warps per inch are what the warps on the loom are. The wraps are used to help figure out how many warps per inch there should be for your project.