In a flowchart, which is a diagram which represents a workflow, a rectangle represents a set of operations or process while  an oval represents a terminal or the beginning and ending of a program.
A flowchart is a type of diagram that represents a workflow or process. Represents a set of operations that changes value, form, or location of data. Represented as a rectangle. Indicates the beginning and ending of a program or sub-process. Represented as a stadium, oval or rounded (fillet) rectangle. They usually contain the word "Start" or "End", or another phrase signaling the start or end of a process, such as "submit inquiry" or "receive product". Process 
