Key Difference: The International Border (IB) is the India–Pakistan Border which serves as a border between the countries of India and Pakistan. This is the international border that is recognized by the world. The term Line of Control (LOC) refers to the military control line between the Indian and Pakistani-controlled parts of the former princely state of Jammu and Kashmir.

The International Border (IB) is the India–Pakistan Border which serves as a border between the countries of India and Pakistan. This is the international border that is recognized by the world. It is quite long and travels over a variety of terrains, ranging from major urban areas to inhospitable deserts as id divides India and Pakistan.

The International Border is based on the artificial Radcliffe line which was published on 17 August 1947 as a boundary demarcation line between India and Pakistan upon the Partition of India. Since its inception it has been in constant conflict between India and Pakistan. It is in fact said to be one of the most dangerous borders in the world.

During the Partition on India and Pakistan, Maharaja Hari Singh, King of the princely state of Jammu and Kashmir agreed to sign the Instrument of Accession as per the suggestion of the then Governor-General, Mountbatten. India then claimed that the whole territory of the princely state of Jammu and Kashmir had become Indian territory due to the accession. However, Pakistan had believed that the state of Jammu and Kashmir will be part of the territory used to form the new nation of Pakistan as its majority was Muslim.

Since that time, the territory of Jammu and Kashmir has been in constant dispute with each country claiming it as its own. The state had become a war ground. Eventually, a Cease-fire Line was designated, with each country controlling one side. Today, the state is divided into Indian controlled Jammu and Kashmir, known as the State of Jammu and Kashmir and the Pakistan controlled Jammu and Kashmir, known as Gilgit–Baltistan and Azad Jammu and Kashmir (AJK). According to the Simla Agreement, which was signed on 3 July 1972, the Cease-fire Line was officially designated as the "Line of Control" (LOC).

While, the official border between is the International Border (IB), the LOC actually is considered to be the de facto border.

Comparison between Line of Control and International Border:

Image Courtesy: en.wikipedia.org, dostpakistan.pk