Learn French: Cette publicité accrocheuse est une vraie tentation. - This catchy advertisement is a real temptation.

You would say: Je me laisse tenter par cette publicité accrocheuse. By using se laisser followed by the infinitive tenter (to tempt), you express the passive idea of allowing yourself to be acted upon by the advertisement.

Why is vraie placed before the noun tentation here? Does the position change the meaning?

Yes! When vrai is placed before the noun, it emphasizes the degree of something, translating to 'real', 'absolute', or 'quite a' (as in a real temptation). If placed after a noun (like in une histoire vraie), it means 'true' as opposed to false.

The word accrocheuse means 'catchy'. What is the root of this adjective?

It comes from the verb accrocher, which means 'to hang', 'to hook', or 'to catch'. So a publicité accrocheuse is literally an ad that 'hooks' your attention. The masculine form of this adjective is accrocheur.

Is it common to use the full word publicité in everyday conversation?

While completely correct, in casual spoken French, it is almost always shortened to la pub. You will frequently hear French speakers say things like cette pub est géniale instead of using the full four-syllable word.