We introduce the definition of De Rham logarithmic classes. We show that the De Rham class of an algebraic cycle of an algebraic variety over a field of characteristic zero is logarithmic and conversely that a logarithmic class of bidegree (d, d) is the De Rham class of an algebraic cycle (of codimension d). We deduce from a previous work the Tate conjecture for smooth projective varieties over fields of finite type over Q, over p-adic fields and over field of characteristic p, p being a prime number.