'Difference in using Node official docker image or building one from scratch

I'm currently focused on the size of the docker image i use, and i don't understand the difference between using an official node image and building my own one. It must be obvious but i can't explain this, if my goal is only to run simple node apps :

FROM node:16.14.2-alpine3.15

-> image weights 111 MB

FROM alpine:3.15

RUN apk update && apk --no-cache add nodejs npm

-> image weights 57 MB

Does someone have a clue ?

Thanks

node.jsdockeralpine


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