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Yes, you can invest in both an IRA and a 401k (or a Roth 401k and a Roth IRA) at the same time, or any combination of those accounts.
The only difference is that IRAs have much lower contribution limits than 401(k)s. In 2015, you can put up to $18,000 into a 401(k) (or up to 23,000 if you are age 50 or older) and $5,500 in an IRA (or up to $6,500 with the catch-up contribution).