Salesforce License

1. Full CRM access
2. We can see Standard apps and custom apps
3. Supports Case object

Salesforce Platform License  

1. Partial CRM access
2. We can see only custom apps
3. Doesn’t support Case object

Salesforce Platform license designed for agents or reps who need access to custom applications and not to standard CRM functionality. They cannot access objects such as forecasts, leads, campaigns, and opportunities.

Reference Article:

https://help.salesforce.com/s/articleView?id=sf.users_license_types_available.htm&type=5

Reference Article:

https://help.salesforce.com/s/articleView?id=sf.users_understanding_license_types.htm&type=5