A lower third is a graphic overlay placed in the lower area of the screen, typically used to display a person’s name, job title, or location. In television and digital media, these elements are placed within the "title-safe area" to ensure they are visible across all devices.
The file you are referring to, , is a professional motion graphics template designed for Adobe Premiere Pro. Using high-quality lower third templates is a cornerstone of modern video editing, as they provide essential context without distracting the viewer from the primary visual content. The Role and Importance of Lower Thirds
Premiere Pro Lower Thirds: Free Templates & How To Use Them - Ftp