Yes. Jainism welcomes both Jain and non-Jain followers to live by its principles.

• Core path for everyone: The Jain path is often explained as the Triple Gem of right faith (samyak darshan), right knowledge (samyak gnana), and right conduct (samyak charitra). Anyone who sincerely follows these can progress on the Jain path toward liberation.
• Lay followers (shrāvakas/shrāvikās): Many people who are not initiated Jains still adopt Jain ethics—ahimsa (non-violence), satya (truthfulness), atra (non-stealing), brahmacharya (continence, where applicable), and aparigraha (non-attachment). They may observe fasting, puja, meditation, and periodic vows, while continuing to belong to their own faith tradition.
• What makes one a Jain: Typically, being a Jain involves accepting the Jain worldview (tirthankaras, karma, moksha), taking refuge in the Three Jewels, and following Jain code of conduct. Those who fully embrace these aspects are regarded as Jains, while others who practice Jain ethics in daily life may be seen as adherents of Jain principles.
• Digambar and Shwetambar nuances: There are differences in emphasis and ritual between Digambar and Shwetambar communities, but both regard ahimsa and the path to liberation as central. The basic idea—that one can aspire to Jain ethics and spiritual aims without necessarily renouncing one’s own religious identity—remains common.

If you’d like, tell me which aspects you’re curious about (dietary practices, meditation, or how lay followers live day-to-day), and I’ll explain them in light of Jain doctrine.