Seal script is a general term for big seal script and small seal script. "Da Zhuan" is the writing of Zhou Dynasty. In a broad sense, Oracle Bone Inscriptions and Jinwen belong to Da Zhuan. In the Zhou Dynasty, after hundreds of years of chaos, different languages were developed in different countries, and we can regard them as all kinds of big seals. After the unification of the six countries, Qin synthesized the seven languages and formulated a common language, namely Xiao Zhuan. Modern Chinese characters evolved from Xiao Zhuan. Although Xiao Zhuan has a history of nearly 2000 years, it still appears on many occasions today, especially in artistic design and calligraphy and painting works.
Xiao Zhuan was created by Li Si. There are many sayings about Da Zhuan, which is said to have been created by Bo Yi in Xia Dynasty.
You can look at Baidu Encyclopedia.