What is "the Church"?

[davidv]

I am still not sure I understand what “the Church” is…is it only those bishops in communion with the pope or not? If it is, then what about bishops who have valid orders?

Please consult the CCC beginning at article 751.
scborromeo.org/ccc/p123a9p1.htm#751

Here you will find an extensive discussion of what the Church is.