Masses
Common People
noun, の adjective
Common peoples make up the masses. They are the common people and no society is complete without them.
Depending on the context, 庶民 can take on a slightly negative connotation, especially if the 庶民 in question are contrasted with more elite or sophisticated groups.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
私みたいな庶民には関係のない話です。
The story has nothing to do with a common person like me.