Term Kind Topic What it is
File-Based Integration pattern Legacy Integration Exchanging data as files on a schedule via SFTP or shared storage — dated, still ubiquitous, and workable when its failure modes are handled explicitly.
Legacy Integration practice Legacy Integration Connecting modern services to systems that cannot be changed — where the constraints are as much commercial and operational as technical.
Shared Database Integration Integration Database concept Legacy Integration Two or more applications reading and writing the same database directly — the most damaging integration pattern and the hardest to unwind.