Mergers & acquisitions (M&A) describes the range of legal transactions by which one company combines with, or takes control of, another. In UK and Irish legal practice this typically covers share purchases, business and asset sales, statutory mergers (more common in Ireland), schemes of arrangement, takeovers of public companies and group reorganisations.“Mergers & acquisitions” is a commercial shorthand rather than a defined statutory term, though specific mechanisms (such as schemes of arrangement, cross‑border mergers, reductions of capital and public takeovers) are governed by detailed company law, securities regulation and competition law. Across England & Wales, Scotland, Northern Ireland and Ireland, usage is broadly consistent, but the underlying company law, court procedures and regulatory bodies differ.Key legal features include: transfer of ownership and control; allocation and limitation of liability; regulatory clearances (for example, merger control and sectoral approvals); due diligence; warranties, indemnities and covenants; and protections for minority shareholders, creditors and employees (including TUPE‑style protections on business transfers).M&A work is central to corporate law practice, private equity, venture capital and capital markets, and often engages tax, employment, pensions, IP, real estate, finance and dispute resolution specialists.