Dorsey said that Parag had been behind every critical decision that helped turn the company around.
"He's curious, probing, rational, creative, demanding, self-aware, and humble," Dorsey said. "He leads with heart and soul, and is someone I learn from daily."
"My trust in him as our CEO is bone deep," he added.
Agrawal, who joined the company as a distinguished software engineer in 2011, became chief technological officer in 2017.
Originally from India, Agrawal completed his bachelor's degree in computer science and engineering from the Indian Institute of Technology, Mumbai.
He holds a Ph.D. in Computer Science from Stanford University.
“The world is watching us right now, even more than they have before," Agrawal said. "Let’s show the world Twitter’s full potential!”
TheStreet Recommends: 4 Key Drivers of Inflation and What Investors Should Do Now