Most palindromes are spelled symmetrically, so their letters produce the same phrase whether read backward or forward:

Able was I ere I saw Elba.

But it’s also possible to do this at the level of words, as in this example:

You can cage a swallow, can’t you, but you can’t swallow a cage, can you?

When this is read backward, word by word, it produces the same sentence as when read forward. And it’s true!