Business litigation can be broadly defined as the legal processes for resolving disputes involving a business, and may include lawsuits, arbitration, mediation, and administrative law proceedings. These business disputes may involve customers, vendors, other businesses, members of the public, insurance companies, or state and federal government agencies.

In Illinois, business litigation encompasses a variety of legal disputes that businesses may encounter. This includes conflicts with customers, suppliers, other businesses, the public, insurers, and government entities. The state's legal framework allows for resolving these disputes through several avenues such as lawsuits in state or federal courts, depending on the nature of the dispute and the parties involved. Illinois also recognizes alternative dispute resolution methods like arbitration and mediation, which can be voluntary or mandated by contract or court order. Additionally, administrative law proceedings may be relevant for disputes involving state or federal agencies, where businesses may need to engage with regulatory bodies or appeal against their decisions. The Illinois Code of Civil Procedure and specific statutes provide the rules for litigation in state courts, while federal disputes are governed by the Federal Rules of Civil Procedure and relevant federal statutes. It's important for businesses to consult with an attorney to navigate these processes effectively and to understand the specific laws and regulations that may apply to their case.