Quality assurance (QA) services encompass the processes and practices to ensure that products being developed reach an established quality threshold. The main goal of QA services is to increase the efficiency of development processes by constantly improving on them.
In software development, QA services mainly mean using extensive software testing to ensure that applications are as free as possible from bugs and vulnerabilities. It’s important to note, though, that QA services aren’t just about bug fixing – they also contemplate the implementation of best coding practices that produce less bugs in the first place.
Functional testing refers to the group of tests conducted to check whether the application meets all the requirements as specified by the product owner. Functional testing uses black-box testing techniques, meaning that the tester is only concerned with seeing if the application works as intended without caring about the internal system logic. The objective of functional testing is almost always getting a bug-free application with a good user interface. That’s why this type of testing includes (but is not limited to) checking data input, expected output, user interface performance, and overall stability, among others.