It depends on the sector/industry. Most places will also tell you beforehand whether or not you'd be paid. As many have said here, tech internships pay quite a bit, and so do internships in the pure sciences fields. Digital media internships are a mixed bag: some pay really well, others do not.
Please check the websites of the places you've shortlisted/are interested in. When you communicate with companies, ask them about pay. Insist on knowing, but do so kindly.
If you're applying through your college/school's placement cell or other such dept., I'm sure they'd be able to tell you more. Best of luck!