<prompt> Translate the following text to EnglishKiwango ambacho mfumo au sehemu ni upatikanaji wa uendeshaji na kupatikana wakati inahitajika kwa ajili ya matumizi, mara nyingi kuonyeshwa kama uwezekano.  <response>: The degree to which a system or component isAvailability operational and accessible when required for use, often expressed as a probability. 