Non-equity/contractual alliance
This is what most people think of when they hear "strategic alliance," established through contracts rather than shared ownership or investment. These partnerships can take many forms, including licensing agreements in which one company uses another's technology or brand, distribution partnerships in which one company sells another's products, or co-marketing arrangements in which companies promote each other's offerings.
The main advantages are flexibility and a lower financial commitment, as partners can easily modify or end the relationship when circumstances change. However, these alliances can be less stable because there's no financial stake to keep the partners committed, and coordinating can be a challenge when companies have different priorities or corporate cultures.