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In these lectures I will show some results obtained with the chiral unitaryapproach applied to the photo and electroproduction of mesons. The results forphotoproduction of $\eta \pi^0 p$ and $K^0 \pi^0 \Sigma^+$, together withrelated reactions will be shown, having with common denominator the excitationof the $\Delta(1700)$ resonance which is one of those dynamically generated inthe chiral unitary approach. Then I will show results obtained for the $e^+ e^-\to \phi f_0(980)$ reaction which reproduce the bulk of the data except for apronounced peak, giving support to a new mesonic resonance, X(2175). Resultswill also be shown for the electromagnetic form factors of the $N^*(1535)$resonance, also dynamically generated in this approach. Finally, I will showsome results on the photoproduction of the $\omega$ in nuclei, showing thatpresent experimental results claiming a shift of the $\omega$ mass in themedium are tied to a particular choice of background and are not conclusive.One the other hand, the same experimental results show unambiguously a hugeincrease of the $\omega$ width in the nuclear medium.

Photo- and Electron-Production of Mesons on Nucleons and Nuclei