Do you share the place you live in and want to practice without causing friction? Or, do you want to play gigs and plug your ukulele into a venue personal address system (PA system) or your own amp/speaker? There are a number of ways to do this.
Firstly, you’ll need an electric ukulele or electro-acoustic ukulele. A purely electric ukulele usually doesn’t make a lot of sound unless it’s plugged in, as it won’t have a body or a soundhole, whereas an electro-acoustic is much like a regular ukulele, but it has a ‘pick up’, meaning that you have a way to plug it in to an amplifier or headphones, using cables or a wireless transmitter. Next, you’ll need a way to attach it to the amp/sound desk, either by using an XLR lead and a jack lead, connected via a DI box, which is like a translator from the ukulele to the sound desk. There are also wireless transmitters. These have 2 separate parts that communicate with each other wirelessly, but one part might need wires in order to connect it to power or the sound desk. Take a look at amplification paraphernalia, here.