How to import fonts in CSS?

I want to use some fonts and I want it to work without having this font on the client computer. I have done this but it doesn't work:

@font-face {
    font-family: EntezareZohoor2;
    src: url(Entezar2.ttf) format("truetype");
}

.EntezarFont {
    font-family: EntezareZohoor2, B Nazanin, Tahoma !important;
}