The top SaaS trends to watch in 2021 include a focus on customer retention and institutional knowledge, the emergence of more vertical-specific SaaS applications, increased practical applications of AI and machine learning, the growth of micro SaaS, the emergence of white label SaaS products, and the increasing use of low code and no code tools. The SaaS sector is expected to continue to experience significant growth, with a compound annual growth rate of around 18% and 80% of businesses using at least one SaaS application. Additionally, 73% of organizations expect nearly all their apps to be SaaS by 2021 and 88% of businesses are planning to invest in new SaaS applications within the next year.