What is mobile
Besides what Farmergirl said above, ( and she is soooo much quicker to answer, than, I am), But since your question was kinda vague, I have to add, " Mobile" is also a Gas and Oil company.
Mobile, in its most basic form, refers to being able to move or be moved freely or easily. It also happens to be the name of a river in southwestern Alabama, which flows into Mobile Bay.
mobile could also refer to a cell phone... a mobile phone, as it were...
A mobile is also a decoration to hang from a ceiling, usually over a baby's crib, to entertain them. Mobile is a city in Alabama as well.