Broadly speaking, fonts without serif are usually called bold, which is a general term for fonts with square characters, horizontal and vertical strokes and equal thickness, and is also called square or isobar. The simple and regular black body does not have much personality in temperament, but it has a wide range of applications and strong plasticity. By enlarging or deforming the font, you can show different temperament. The main fonts have also developed their own unique bold. Ui visual designers are good at creating their own style characteristics for products or brands, and have high artistic level and expressive ability. Will cooperate with some pictures of display equipment to mix the information to be expressed, so that users can intuitively and easily understand the meaning conveyed by brand products. For ui designers in the interactive era, what they need more is the analysis and positioning of product concepts, as well as the testing and evaluation of product usability. They are better at analyzing the users' needs of this product, thus making the structural information of the whole product more reasonable and perfect, and finally making the product accepted and loved by the majority of users.