A floater is either a tech or a pharmacist who does not have a permanent store assignment - similar to working "relief" in an institutional setting.
You always have a "home" store....because some location is "charged" with your pay & you always have to get your check or deposit receipt sent to one location.
But....you may work in a number of locations on any given week....or you could get a long term assignment - for example to cover for someone's surgery or pregnancy or other leave.
The issue comes when you work in a large urban area (I'm familiar with the LA basin & the SF bay area in CA)....you can drive only 30-40 miles, but it could take you 1-2 hrs.....its significant wear & tear on you & your vehicle. IMO...the mileage doesn't make up for the headache...but thats just me....😀 For longer distance floats...they will pay for hotel, a meal, etc...but that gets old quick (altho.....in the summer...Zephyr Cove near Lake Tahoe, NV always needs floaters to cover the pharmacists vacations....but you need a NV license🙁 ) That would be a good assignment for a week!
Floater will cover vacation days, short days, sick days, stores which are notoriously malignant & just can't get staffing...etc....