This refers to a method of joining wood planks edge to edge, widely available at a major home improvement retailer. The system employs a projection (the tongue) on one edge of a board that fits precisely into a matching groove on the adjacent board. This creates a strong, seamless, and visually appealing surface, commonly used for flooring, wall paneling, and ceilings. These materials are often sought for both their aesthetic qualities and ease of installation.
The enduring popularity of this joining technique stems from its inherent stability, efficient installation process, and ability to create a closed, unified surface. Historically, it has been a cornerstone of woodworking, providing a robust solution for creating flat, even planes in various construction and finishing applications. Its availability at a large retail chain makes it accessible to both professional contractors and DIY enthusiasts, facilitating a wide range of projects.