Linear guide for furniture making?

What do I need a linear guide in a piece of furniture for? Perhaps “furniture fitting” is a better word to describe the task in this context. Furniture is becoming increasingly alterable: it changes seat positions and posture, table heights can be adjusted as required, doors slide ultra-silently, TV monitors are positioned in all directions, and small tables can easily be made larger to reach their full size. For a linear guide or a furniture fitting, this means: it must be robust, easy to adjust, must produce no noise, must be maintenance-free, absolutely clean and, at the same time, as light as possible. Here, you can find great ideas for use in all areas of furniture making:

https://www.igus.eu/contentData/Product_Files/Download/pdf/EN_industry_furniture_web.pdf