The purpose of a data flow diagram is to show you how the data flows through an information system. A sequence diagram shows you information regarding how the processes work together and in what order they operate.
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Data flow diagram and sequence diagram both are used in requirement engineering. Data flow diagram are used to indicate the flow of data. Sequence diagrams indicates the sequence of flow of data.
State diagram represents behavior without noting the classes involved whereas sequence diagram represents behavior, by describing how classes move from state to state
The difference between a graph and a diagram is as follows: a diagram is a chart which shows a drawing and a graph is a graph with lines or bars indicating something specific in numbers.
difference between cross section and block daigram
The main difference between use cases and class diagrams is that a diagram shows how data is related. On the other hand, use cases show how a user uses a system.
The difference between graphs and charts is mainly in the way the data is compiled and the way it is represented. Graphs are usually focused on raw data and showing the trends and changes in that data over time.