Adopting a microservices architecture brings a host of benefits, including increased autonomy, flexibility, and modularity. But the process of decoupling a single-tier monolithic application into smaller services introduces new obstacles: what's running, how to roll out updates, how to secure and monitor all such fleet? To address these challenges, you can use a service mesh. With this talk, we are going to refresh basic knowledge and pillars of the "service mesh" and share our experience and concerns about the most popular one - Istio. Welcome to the service mesh era!