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Unit tests are very specifically tests which focus on a small piece of logic, isolated from everything else for the sake of speed (so that you can run them often and get fast feedback on new bugs). Those tools can be used to run say tests using the Selenium framework - in that case you are writing acceptance tests using a unit test runner. The common confusion here is to think that if you're using a unit testing tool, such as xUnit or Rspec, to run tests that you are writing unit tests.
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Unit Testing is about testing a code in small, isolated units.
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More recently, TDD has become even more specifically about writing unit tests in that cycle, to distinguish it from ATDD (a subset of BDD) which is writing acceptance tests in a similar cycle. This is done in cycles, fail -> pass -> refactor, adding a new test for each known requirement for the code. TDD is writing a test which will fail, then writing the minimum amount of code required to make it run, then refactoring the code to make it clean. TDD and Unit Testing are two very specific terms which often get misused. Writing tests first is simply a prerequisite for being able to let the tests drive the development.) There are plenty of projects that write tests first but don't practice TDD. (This is important: TDD is not about writing tests first. They tell you what the API is going to be, what the design is. The tests tell you what to do, what to do next, when you are done. The most important part of TDD is the middle D. You can do that with unit tests, functional tests and acceptance tests. TDD means (again, kind of obvious) letting your tests drive your development (and your design). You can write unit tests before you write your code, after you write your code or while you write your code. (I know that those two definitions are circular, but they seem to work out quite well in practice.) An individual unit of behavior is the smallest possible unit of behavior that can be individually tested in isolation. Unit Testing means, well, testing individual units of behavior.
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Test Driven Development is a key discipline every software developer should practice to ensure the quality of their code.