Summarize the text below in less than 15 words.
Software testing is a process of verifying, or validating, the software product for guaranteeing its fitness for use.
Software testing verifies the product's usability.
Complete the following task based on the instruction and optional input provided.### Instruction:
Summarize the text below in less than 15 words.

### Input:
Software testing is a process of verifying, or validating, the software product for guaranteeing its fitness for use.

### Output:
Software testing verifies the product's usability.