1.流程图：
流程图是算法的图解表示。有时程序员将其用作解决问题的程序规划工具。它利用它们之间相互连接的符号来表示信息的流动和处理。在程序中表示控制流是一种方便的技术。
2. 数据流图(DFD)：
数据是指信息，流是指移动，图是指一张图来表示某事。因此，DFD 基本上是数据或信息流的图形表示。它是数据系统的框架或模式。它包括存储数据、数据输入、数据输出。它被描述为将数据作为输入，存储数据，将数据作为输出的过程。它描述了完成该过程的数据路径。
流程图和数据流图的区别：
| S.No. | Flow Chart | Data Flow Diagram (DFD) |
|---|---|---|
| 1. | The main objective is to represents the flow of control in program. | The main objective is to represent the processes and data flow between them. |
| 2. | It has only a single type of arrow is used to show the control flow in flow chart. | It defines the flow and process of data input, data output, and storing data. |
| 3 | It is the view of the system at a lower level. | It is the view of the system at a high level. |
| 4. | These are represented by three symbols. | These are represented by five symbols. |
| 5. | It deals with the physical aspect of the action. | It deals with the logical aspect of the action. |
| 6. | It shows the how to make system function. | It defines the functionality of the system. |
| 7. | It is not very suitable for a complex system. | It is used for complex systems. |