What employees like the most about working at the 15 best companies in America

• Glassdoor just recently published its list of the best companies of 2018.

• Business Insider scoured the job site to find out what employees loved the most about their workplaces.

• Reviewers appreciated mission-driven companies, smart colleagues, and a strong sense of work-life balanced.

Glassdoor's list of the best companies of 2018 is out, and companies from all kinds of industries - from tech to retail to finance - are represented.

To discern what made the companies featured in the rankings stand out, we scoured hundreds of reviews for the top 15 companies.

We found a few recurring themes in the positive reviews of said companies. People seem to value mission-driven workplaces, as well as organizations that foster a strong work-life balance, attract smart coworkers, and provide opportunities for training and learning.

Here's a look at what employees love about working at the 15 most popular companies in the US: