ISTQB define testing levels

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ISTQB defines testing levels as a way to categorize testing activities based on their objectives and scope.

There are four levels of testing defined by ISTQB: component testing, integration testing, system testing, and acceptance testing.
Each level of testing has a specific objective and scope.
Component testing involves testing individual software components in isolation.
Integration testing involves testing the interactions between different software components.
System testing involves testing the entire system as a whole.
Acceptance testing involves testing the system against the requirements and expectations of the end-users.
Testing at each level is typically performed by different teams with different skill sets and responsibilities.

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