What quality and reliability mean to the consumer
For the user of a product, the product should perform its intended/designed function when used as per the prescribed method and in prescribed operating environment. If it fails to perform a required function or deviates from the required performance, it is declared as a bad-quality product.
Not only should the product perform its function immediately after installation but it should perform without failure over its required operational life time. If it fails very frequently during its operational life-time (for example, a television failing twice or thrice every year), then also it is declared as a bad-quality product.
Quality and reliability engineers relate quality to general performance of a system when it’s operated under allowed stresses, and reliability to time-oriented performance without failures.