A sequence is an ordered series of actions.
In a simple program, one statement executes and then the next statement follows.
Consider this soccer sequence:
Each action prepares information needed by the actions that follow.
If you change the order, the result may change or stop making sense.
Suppose the program needs to display the roster for Saturday's match.
This sequence makes sense:
Now rearrange the steps:
The first instruction now asks the program to display information before the program has established which roster it needs.
The steps did not disappear.
Their order changed.
That is enough to create a problem.
You have already seen objects whose values change.
Imagine:
The arrows communicate:
This simple visual idea leads into flowcharts and UML activity diagrams.
Later, the path can split when a program makes a decision.
For now, focus on a single path from one action to the next.
The same reasoning appears in technical processes.
For example:
Running before saving may execute an older version.
Submitting before saving may send an older file.
Sequence affects technical work even when the steps are not C# statements.
When tracing instructions, keep asking:
Those questions turn a list of statements into a story of how the program changes over time.
That is the foundation for understanding program flow.