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You received an .indd file and you don't have Adobe InDesign. This is going to be a problem. InDesign's native format stores professional page layouts — books, magazines, brochures, annual reports, posters — with precise control over typography, colour management, image placement, and print-ready output that no other application fully replicates.
InDesign is the industry standard for multi-page layout and print production. An INDD file contains master pages, paragraph styles, character styles, linked images (referenced rather than embedded), and prepress settings. The files can be enormous because they store a full editing history and layout state. Unlike Photoshop (where Affinity Photo comes close) or Illustrator (where Affinity Designer competes), InDesign has fewer viable alternatives for complex publication work.
Adobe InDesign (Creative Cloud subscription) opens INDD natively. Affinity Publisher ($70, one-time) can import INDD files with reasonable fidelity — it's the best non-Adobe option. For just viewing the layout without editing, ask the sender for a PDF export. If you're a designer choosing between InDesign and Affinity Publisher, both are capable — InDesign's advantage is industry entrenchment and better prepress tools.