Block diagram - Template
"Block diagram is a diagram of a system in which the principal parts or functions are represented by blocks connected by lines that show the relationships of the blocks. They are heavily used in the engineering world in hardware design, electronic design, software design, and process flow diagrams." [Block diagram. Wikipedia]
The block diagram template for the ConceptDraw PRO diagramming and vector drawing software is included in the Block Diagrams solution from the area "What is a Diagram" of ConceptDraw Solution Park.