Ubiquitous is an adjective that means omnipresent or found everywhere.
Ubiquitous derives from the Latin word ubi, which means where and then ubique, which means "everywhere", to which the suffix -ous is added to indicate something that is everywhere.
The correct pronunciation of ubiquitous is yoo-BIH-kwih-tus.
The stress must be pronounced on the second syllable, -BIH. The "u" in the first syllable is pronounced exactly like the word "you". The "i" in the second syllable is pronounced as a short "i", so it is pronounced as "ih". In the third syllable, the "qui" is phonetically pronounced as -kwih. Finally, the last syllable is pronounced with a slightly closed -tus sound.