A process for delivering productive software by translating product ideas into delivered features. SDLC is a life cycle because of the feedback loop of bugs and users that return from delivered software.
Product Strategy -> Product Managers -> Ideas -> SDLC -> Features
Tooling
JIRA is a ubiquitous tool for tracking the SDLC, particularly within Scrum and Agile processes. On top of JIRA there are also higher level delivery tracking tools and metrics.
Ben Balter argues that you can manage using existing software tooling (Github Issues/PRs/Boards) to work in public. You can of courses achieve similar effects using Atlassian or other document tools. However, markdown/git/github may be more accessible to your team. More likely, consistency and transparency is more important than tooling1.
1. Balter, B. Manage like an engineer. https://ben.balter.com/2023/01/10/manage-like-an-engineer/ (2023).