1. A bill is a proposed law presented in parliament or state assembly. It becomes an act after being passed by both houses of parliament/assembly, ratified by the president/governor, and notified in the official gazette.
2. An act is implemented by the executive like government officers and ministries. It can establish rules or norms that are generally followed.
3. Evidence presented during a trial can include witnesses, records, documents or materials and is considered in determining if an accused is convicted or acquitted of charges.