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Description
Asked frequently enough that it is worth a quick explanation.

AtsusaKaneytza adds this valuable advice, when resizing in FireAlpaca or MediBang Paint:
"""
The different resize types are actually helpful depending on the type of art that you're editing.
If you're doing pixel art, or something of that sort, where the edges have to be blocky and not very anti-aliased, then "Nearest Neighbor" is the best resize method.
If you have gradients, or really smooth/soft transitions between colors, like photographs and things like that, then "Bilinear" resizing is considered best for those.
If you're resizing something like lineart or cel-shaded style art, etc. with very clean lines and coloring, then "Bicubic" is the best resizing method that doesn't make your resized art look too blurry.
"""

Transcript:

Raster (or bitmap) images are basically mosaics made up of "pixel tiles".
Here we have zoomed in on one small portion of an image.

Now if you want to make this smaller FireAlpaca has to draw this same image with less tiles (pixels).

For example, the above 5x5 grid has to now fit into a 3x3 pixel grid.

This pixel has more black than white, so it will be drawn as a darkish grey.
This tile is mostly white with a little bit of black, so the new pixel will be drawn as a pale grey.
This pixel combines about a third white, some red, and a tiny bit of blue, so it will be drawn as a pale red (pink) with a slight purple tint.

So your resized piece of image might be made up out of these pixels.

If you zoom out so you can't see individual pixels (tiles), this looks like a blurred version of your original piece.

Similarly, if you resize up so Firealpaca has to draw that 5x5 grid in (for example) 7x7 pixels.
You might end up with something that looks a little like this:

Again, it looks a bit like a badly blurred version of the original.

This is why resizing always ends up with quality loss or "blur".

It is FireAlpaca's attempt to retain the true proportions of your original art while drawing it with a different number of tiles.

Description
Asked frequently enough that it is worth a quick explanation.

AtsusaKaneytza adds this valuable advice, when resizing in FireAlpaca or MediBang Paint:
"""
The different resize types are actually helpful depending on the type of art that you're editing.
If you're doing pixel art, or something of that sort, where the edges have to be blocky and not very anti-aliased, then "Nearest Neighbor" is the best resize method.
If you have gradients, or really smooth/soft transitions between colors, like photographs and things like that, then "Bilinear" resizing is considered best for those.
If you're resizing something like lineart or cel-shaded style art, etc. with very clean lines and coloring, then "Bicubic" is the best resizing method that doesn't make your resized art look too blurry.
"""

Transcript:

Raster (or bitmap) images are basically mosaics made up of "pixel tiles".
Here we have zoomed in on one small portion of an image.

Now if you want to make this smaller FireAlpaca has to draw this same image with less tiles (pixels).

For example, the above 5x5 grid has to now fit into a 3x3 pixel grid.

This pixel has more black than white, so it will be drawn as a darkish grey.
This tile is mostly white with a little bit of black, so the new pixel will be drawn as a pale grey.
This pixel combines about a third white, some red, and a tiny bit of blue, so it will be drawn as a pale red (pink) with a slight purple tint.

So your resized piece of image might be made up out of these pixels.

If you zoom out so you can't see individual pixels (tiles), this looks like a blurred version of your original piece.

Similarly, if you resize up so Firealpaca has to draw that 5x5 grid in (for example) 7x7 pixels.
You might end up with something that looks a little like this:

Again, it looks a bit like a badly blurred version of the original.

This is why resizing always ends up with quality loss or "blur".

It is FireAlpaca's attempt to retain the true proportions of your original art while drawing it with a different number of tiles.