This type of flooring features a click-lock or snap-lock design. The planks or tiles have specially designed edges with a tongue on one side and a groove on the other. To install them, you simply align the tongue of one plank with the groove of another and then press or click them together. The locking mechanism provides a tight, secure fit.

Installation is often considered easier and faster for DIYers because it doesn't require the use of adhesives or nails. The planks simply snap or click together, and they can often be floated over an underlayment or existing subfloor.

The click and lock design typically creates a strong and stable connection, reducing the likelihood of gaps or separation between planks. This makes it a good choice for areas with heavy foot traffic or for DIY installations.

Click and lock systems are commonly used for floating floor installations. They are versatile and can be installed over various types of subfloors, including concrete, plywood, or existing flooring.

Tongue and groove flooring also have specially milled edges, but they have a more traditional tongue-and-groove design. The tongue of one plank fits into the groove of the adjacent plank, creating a strong, interlocking connection. This design has been used for centuries in various applications, including hardwood flooring.

Installing tongue and groove flooring typically involves more steps. You'll need to apply adhesive to the grooves or use nails or staples to secure the planks to the subfloor. It's a more traditional installation method and may require more skill and tools.

Tongue and groove flooring also offers durability and stability, but the quality of installation and subfloor preparation can have a significant impact on its performance.

Tongue and groove flooring is often used for nail-down or glue-down installations. It may be a better choice for certain types of hardwood or engineered hardwood floors.