Job Recruitment Website - Job information - When recruiting designers, it is required to know PS, CDR, and CAD. What do these three things mean?

When recruiting designers, it is required to know PS, CDR, and CAD. What do these three things mean?

PS refers to photoshop image processing software, mainly used for graphic design; CDR format is a special graphics file format for the drawing software CorelDRAW, which is vector graphics drawing software; CAD refers to computer drawing software, such as : Construction drawings, etc.