Accel is a venture capital firm. It gives money to startups early, usually before anyone else has, and takes a stake in return. It has done this since 1983, and it wrote the first institutional cheque into Atlassian, CrowdStrike, Flipkart and Slack.
Source: [TNW](https://thenextweb.com/news/accel-europe-fund-800m-3-5bn-four-funds)