Relying on a script prevents you from learning the actual mechanic. The legitimate manual version of this move is often called "Gstrafe" or "Ground Strafe."
These are configuration files that automatically execute when the game launches. They can include:
The phrase "cs 16 sgs script link" is a specific artifact of internet culture. It stems from a time when file hosting was fragmented. Unlike today, where Steam Workshop integration is seamless, CS 1.6 mods and scripts were shared via MediaFire, MegaUpload, or direct forum attachments.
Players would beg for the "link" because: