How to connect postgresql pod with another application pod?

In Docker-Compose it running well, but when I tried Kubernetes I’m not able to connect to it.

docker-compose.yaml

version: ‘3’

services:
db:
image: postgres
restart: always
environment:
POSTGRES_PASSWORD: db-pass
ports:
- 5433:5432

service:
build: .
ports:
- “8000:8000”
depends_on:
- db
environment:
CONFIG_PROFILE: local-docker

Can anyone help me to convert to deployment & service files?

Thanks in advance!!!