In point to point link, there is a pair of bridges which are used to connect two network segments, whereas in a point to multi point bridge, one bridge is installed as root bridge, and many non-root bridges attach to this root bridge.
There is a pair of bridges. This is in point. This is to point link. These bridges are used to connect two network segments. One bridge is installed as root bridge. This was in a point to multi point bridge. Many non-root bridges attach to this root bridge.