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Software Bugs – 8 Basic and Important Types

8 Important Types of Software Bugs

Characteristics that qualify a software as good include usability, correctness, efficiency, reliability, integrity, adaptability, etc., however, one of the things that jeopardizes the quality of digital products are software bugs.

Regardless of how careful or skilled a developer may be, software bugs are bound to arise or exist within a program. Added to this, is the fact that projects today are becoming more complex – putting a lot of pressures on software development teams including the writing and integration of massive lines of code in a bid to meet up with businesses and clients requirements, yet having to fight the monsters called bugs.

There are different software types available in the industry including system software, application software, open source software, firmware, freeware, shareware, driver software, etc., and an experienced software developer must as well be fully aware of the different kinds of bugs that exist within any software, to be able to identity or recognize them more easily, knowing the proper way to address them. This article discusses what software bugs are and the different types of bugs in software development.

What are Software Bugs?

Software bugs are flaws, problems, faults, failures, or errors in a computer system or program that causes it to perform incorrectly, unexpectedly or produce unintended results which can result to the system crashing or failing.

Whenever any new software is developed or an existing one is updated, various major and minor bugs comes with it. These could be due to programming errors (program’s design or its source code), however, there are different stages to errors and bugs are named according to the stage they were identified which include:

  • Error: this is a mistake in the coding phase of a software which is identified by developers.
  • Defect: this is an error found in the testing phase of a software, usually identified by testers. If an error isn’t fixed in the coding stage and quality assurance (QA) finds it, then the error becomes a defect.
  • Bug: if the defect is accepted by the development team, then it becomes a bug.
  • Failure: when testers fails to define an error as a defect and development team are not aware of it before the system goes into production stage, then the bug will end up as a failure for users to discover.

Software bugs are of many types and it is essential to fully get a grasp of their nature, implications and causes to be able to process them better.

Types of Software Bugs

  1. Functional errors: the functionality of a system is the expected result it’s meant to produce. Functional errors happens whenever a software doesn’t behave as intended and it ranges from smaller issues such as unclickable buttons to bigger problems like being unable to utilize the main function of the software at all.
  2. Syntax errors: these occurs in the source code of a software and it is very common and typically occurs when there are one or more missing or incorrect characters in the code.
  3. Performance errors: these are tied to the software’s speed, stability, response time, and resource consumption which are usually identified during the performance testing stage.
  4. Usability errors: these types of errors hinders a user from using the software to its fullest capability and, thus, hamper a user’s experience with the software.
  5. Compatibility errors: when a software does not show consistent performance on some particular types of hardware, operating systems, browsers, and devices or when integrated with certain software or operating under certain network configurations, it is said to have compatibility error.
  6. Security errors: these type of software bugs allow unauthorized access or control on a computer system, opening the software or company up to a serious potential attack. Some of the most common security errors include encryption errors, susceptibility to SQL injections, XSS vulnerabilities, buffer overflows, logical errors, and inferior authentication, among others.
  7. Logic errors: are errors in the flow of your software that can cause a software to produce the wrong output, crash, or even software failure. Example is infinite loop.
  8. Calculation Errors: these errors occur due to bad logic, incorrect formulae, data type mismatch, coding errors, function call issues etc.


A large percentage of bugs stem from the mistakes that were unintentionally made when designing software or its source code, or even from the components and the operation system that were used. It takes an experienced and qualified software development team to produce a quality assured software product.

Hiring an expert like Podtech will not only make sure that defects are handled effectively but also streamline defect prioritization which will in turn speed up defect fixes and increase the overall efficiency of testing and development processes – giving you and your company a good software product that safely meets all your business needs.